Hafiz sarfraz ali presentation final
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This document discusses the types, advantages, and limitations of magnetic tapes. It outlines four common types of magnetic tapes: 1/2-inch tape reel, 1/2-inch tape cartridge, 1/4-inch tape reel, and 4mm digital audiotape. The advantages include unlimited storage, low cost, portability, and use for data backup. However, magnetic tapes have sequential access which is not suitable for random access storage and require careful handling and storage in dust-free environments.
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Introduction to Data tapes
Brief introduction to the mechanism behind data tape technology.
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Magnetic Tape
Computer Application-Magnetic Tape
Primary Storage Vs. Secondary Storage
Sequential and Direct Access Devices,Storage Organization
Millipede memory
Millipede memory is a non-volatile computer memory stored on nanoscopic pits burned into the surface of a thin polymer layer, read and written by a MEMS-based probe. It promised a data density of more than 1 terabit per square inch (1 gigabit per square millimeter), which is about the limit of the perpendicular recording hard drives. Millipede storage technology was pursued as a potential replacement for magnetic recording in hard drives, at the same time reducing the form-factor to that of flash media.
Secondary storage devices
Secondary storage devices hold information regardless of whether the computer has power. Examples include floppy disks and hard drives. Secondary storage is slower than primary storage but is used for storing programs and data due to its larger size and lower cost. Magnetic tapes and disks are common sequential and direct access storage devices that differ in their access methods and performance characteristics. Tapes are portable but slow to access random data while disks allow faster random access but have lower capacity than tapes.
multimedia storage and playback or retrival methods or techniques copy
This document discusses different techniques for data storage, retrieval, and playback of multimedia files. It describes various storage media like optical disks and hard drives that can be used to store multimedia. Retrieval of multimedia depends on whether the file is continuous or discrete media. There are different access techniques for retrieving data like sequential, direct, and index sequential access. Magnetic storage uses magnetization patterns to store data on mediums like hard disks or floppy disks. Optical disks like CDs and DVDs also store data that can be read with lasers. Disk spanning allows data to exceed storage capacities by spreading across multiple disks.
Magnetic reel tape
Magnetic reel tape is a medium for magnetic recording consisting of a magnetizable coating on a plastic strip. Oberlin Smith published early works on magnetic recording in 1880. Valdemar Poulsen developed the magnetic wire recorder in 1898. Fritz Pfleumer invented magnetic tape based on these previous inventions, using ferric oxide on paper. Magnetic tape can store large amounts of data serially and was used for analog sound/video recording and digital data storage starting in 1951. While portable and reliable if undamaged, tape has disadvantages like slow access, need for a drive, and quality deterioration over multiple copies or near strong magnetic fields.
Secondary storage
Secondary storage devices are used to permanently store large amounts of data due to the limited storage of primary memory. They include floppy disks, hard disks, magnetic tape, pen drives, optical disks, and external drives. Secondary storage devices have higher storage capacity than primary memory but are slower, hold data permanently even when powered off, and require data to be copied to primary memory to be accessed by the CPU. They each have different characteristics in terms of storage size, portability, data access speed, and application.
Computer Memory
The document summarizes the evolution of storage devices from punch cards to cloud computing. It describes early magnetic storage devices like magnetic drums and tapes. Floppy disks emerged as popular portable storage that could hold 80kb of data. Optical discs like CDs and DVDs increased storage capacity but required optical drives. USB flash drives provided solid state portable storage. Blu-ray discs stored high definition video. Finally, cloud computing emerged which stores and accesses data over the internet rather than local hard drives.
Recommended
Introduction to Data tapes
Brief introduction to the mechanism behind data tape technology.
Meanwhile, connect with ODSI - Online Digital Solutions, UK by following the below mentioned links:
ODSI Blog: www.odsi.co.uk/blog
Twitter: http://bit.ly/1ai6Zwe
Facebook: http://on.fb.me/1ai6Ys7
LinkedIn: http://linkd.in/18C2WE6
Google+: http://bit.ly/15s113Z
Pinterest: http://bit.ly/14ia10O
While connect with me at the following:
LinkedIn: http://linkd.in/17yrzog
Email: zoey.zurnab@odsi.co.uk
Magnetic Tape
Computer Application-Magnetic Tape
Primary Storage Vs. Secondary Storage
Sequential and Direct Access Devices,Storage Organization
Millipede memory
Millipede memory is a non-volatile computer memory stored on nanoscopic pits burned into the surface of a thin polymer layer, read and written by a MEMS-based probe. It promised a data density of more than 1 terabit per square inch (1 gigabit per square millimeter), which is about the limit of the perpendicular recording hard drives. Millipede storage technology was pursued as a potential replacement for magnetic recording in hard drives, at the same time reducing the form-factor to that of flash media.
Secondary storage devices
Secondary storage devices hold information regardless of whether the computer has power. Examples include floppy disks and hard drives. Secondary storage is slower than primary storage but is used for storing programs and data due to its larger size and lower cost. Magnetic tapes and disks are common sequential and direct access storage devices that differ in their access methods and performance characteristics. Tapes are portable but slow to access random data while disks allow faster random access but have lower capacity than tapes.
multimedia storage and playback or retrival methods or techniques copy
This document discusses different techniques for data storage, retrieval, and playback of multimedia files. It describes various storage media like optical disks and hard drives that can be used to store multimedia. Retrieval of multimedia depends on whether the file is continuous or discrete media. There are different access techniques for retrieving data like sequential, direct, and index sequential access. Magnetic storage uses magnetization patterns to store data on mediums like hard disks or floppy disks. Optical disks like CDs and DVDs also store data that can be read with lasers. Disk spanning allows data to exceed storage capacities by spreading across multiple disks.
Magnetic reel tape
Magnetic reel tape is a medium for magnetic recording consisting of a magnetizable coating on a plastic strip. Oberlin Smith published early works on magnetic recording in 1880. Valdemar Poulsen developed the magnetic wire recorder in 1898. Fritz Pfleumer invented magnetic tape based on these previous inventions, using ferric oxide on paper. Magnetic tape can store large amounts of data serially and was used for analog sound/video recording and digital data storage starting in 1951. While portable and reliable if undamaged, tape has disadvantages like slow access, need for a drive, and quality deterioration over multiple copies or near strong magnetic fields.
Secondary storage
Secondary storage devices are used to permanently store large amounts of data due to the limited storage of primary memory. They include floppy disks, hard disks, magnetic tape, pen drives, optical disks, and external drives. Secondary storage devices have higher storage capacity than primary memory but are slower, hold data permanently even when powered off, and require data to be copied to primary memory to be accessed by the CPU. They each have different characteristics in terms of storage size, portability, data access speed, and application.
Computer Memory
The document summarizes the evolution of storage devices from punch cards to cloud computing. It describes early magnetic storage devices like magnetic drums and tapes. Floppy disks emerged as popular portable storage that could hold 80kb of data. Optical discs like CDs and DVDs increased storage capacity but required optical drives. USB flash drives provided solid state portable storage. Blu-ray discs stored high definition video. Finally, cloud computing emerged which stores and accesses data over the internet rather than local hard drives.
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This presentation discusses magnetic tapes as a secondary storage device. It explains that magnetic tapes use a thin, magnetizable coating on a plastic film to store data in tracks and records that are accessed by a read-write head. Magnetic tapes provide serial access storage and can store up to 29.5GB per square inch, more than a dual-layer Blu-ray disc.
Secondary storage devices
Secondary storage devices include floppy disks, hard disks, CDs, DVDs, Blu-ray discs, pen drives, and memory cards. These are non-volatile storage options that operate alongside primary storage like RAM. Floppy disks store data on magnetic coated plastic plates divided into tracks and sectors, while hard disks use metal plates for higher capacity. Optical discs like CDs, DVDs, and Blu-rays encode data through laser etching in pits arranged in a tight spiral, allowing greater storage densities over time. Portable options include pen drives with removable flash memory and memory cards commonly used in cameras, phones, and other electronics.
Secondary Storage
Floppy disks, tapes, zip disks, and hard disks are examples of different storage media that vary in size, storage capacity, accessibility, and portability. Floppy disks have low storage capacity and portability while hard disks have high storage capacity but low portability. Storage media can be optical like CDs, DVDs, or magnetic like floppy disks, hard drives, zip disks, and tapes. Magnetic media uses magnetism to store data and can be accessed directly or sequentially, while optical media uses lasers to read binary data encoded as pits on the storage surface. Flash memory is a type of solid-state circuit media that can be electrically erased and rewritten in blocks.
Magnetic tape
Magnetic tape consists of a thin plastic ribbon coated with magnetic material that can be magnetized to store binary data in sequential tracks and frames, allowing it to serve as a primary means of backup and data transfer between systems in a cost effective manner. Magnetic tape uses tape heads with electromagnetic coils and ferromagnetic cores to magnetize the coating and read the magnetic patterns representing stored data. While magnetic tape provides high storage capacity at low cost and is suitable for batch processing, it also has disadvantages such as slow data transfer rates and inability to randomly access specific data.
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Backing storage refers to permanent storage devices like hard drives and USB flash drives that are used to save files and data when the computer is switched off. Magnetic storage devices like hard disk drives store data using magnetization on metal disks, allowing for high storage capacities. Hard drives are fixed internally while portable external drives also exist. Magnetic tape is used for backups due to low cost and ability to store terabytes of data sequentially. Solid state devices have no moving parts and include USB flash drives and memory cards used in cameras and phones, providing portable storage up to 512GB. Optical storage technologies like CDs, DVDs use lasers to burn pits and lands encoding data, with read-only, write-once, and rewritable
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This document provides an overview of secondary storage devices, including magnetic storage devices like magnetic tapes, hard disks, and floppy disks. It also discusses optical storage devices such as compact discs, digital versatile discs, and Blu-ray discs. Finally, it covers flash drives. The document describes the basic components and features of these various storage technologies and how they work to store digital data.
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The document discusses the history and evolution of computer hardware from the first generation of vacuum tube computers to current generation computers using grand-scale integrated circuits. It describes the main components of computer hardware including the central processing unit, primary and secondary storage, and input/output devices. It also covers topics such as computer memory, microprocessors, and emerging technologies.
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This presentation discusses various storage devices used in computing. It describes primary storage devices like RAM and ROM that provide temporary data storage and access. Secondary storage devices like hard disk drives, solid state drives, optical discs (CDs, DVDs, Blu-Rays), magnetic tapes, and USB flash drives provide permanent and portable data storage. The presentation covers the basic working, types, advantages and disadvantages of these common storage devices.
secondary storage devices
Secondary storage devices are non-volatile memory that stores large amounts of data at lower costs than primary memory. There are two main types of secondary storage devices: sequential access devices like magnetic tapes that are very fast for sequential data but slow for random access, and direct access storage devices (DASDs) like hard disks that allow for high-capacity random access storage. Magnetic disks are the most widely used secondary storage, offering high storage capacity, reliability, and the ability to directly access stored data.
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This document defines and describes several types of storage media devices including discs (CD, DVD, floppy), flash memory cards (SD, MMC, xD), and tape drives. It provides details on the size, storage capacity, intended use, and other specifications for each type of media.
Secondary storage devices
The document discusses different types of secondary storage devices. It describes sequential access devices like magnetic tapes that read and write data sequentially. It also describes direct access devices like hard disks that allow random access to stored data. Hard disks, floppy disks, disk packs, and zip disks are examples of magnetic disks. Optical disks like CDs, DVDs, and Blu-ray disks are also covered. Each type of secondary storage device has advantages and limitations in terms of storage capacity, access speed, portability and reusability.
Secondary Storage Devices
Secondary storage devices such as hard disks, CDs, USB drives, and Blu-ray discs are used for bulk storage of data with large capacities and transfer data to main memory for processing. Hard disks provide fast storage and high capacities, storing data on magnetic disks accessed by read/write heads. CDs and Blu-ray discs use optical technology to store digital data in pits encoded in spiral tracks, with Blu-ray using a blue laser to achieve higher densities. USB drives are portable flash memory devices that can easily transfer data between computers. Secondary storage is cheaper than main memory and has slower access times.
Memory Devices
Secondary storage is required for computers for three reasons: primary storage is volatile, has limited capacity, and is more expensive than secondary storage. Secondary storage includes magnetic media like hard disks and floppy disks, as well as optical media like CDs and DVDs. These devices store large amounts of data permanently but are not directly accessible by the CPU, so they have slower access times than primary storage.
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Secondary Storage DevicesWe Learn - A Continuous Learning Forum from Welingkar's Distance Learning Program.
Secondary storage devices are used to store data semi-permanently as primary storage is volatile. Common secondary devices include floppy disks, hard disks, CDs/DVDs, pen drives, and magnetic tapes. Floppy disks use magnetic material coated plastic disks to store data in tracks and sectors, allowing direct access. Hard disks have multiple rigid platters that spin rapidly, containing data on both sides. Data is read and written by heads positioned very close to surfaces. Pen drives use flash memory and a USB interface for portable storage. DVDs can store more data than CDs due to higher density encoding and multilayer capabilities.Secondary storage devices
The document summarizes secondary storage devices, including magnetic disks and optical disks. Magnetic disks store data on circular platters that rotate rapidly. Data is written to and read from the disks using read/write heads. Disks are organized into tracks, sectors, cylinders, and clusters. Accessing data involves seek time, rotational latency, and transfer time. Optical disks like CD-ROMs encode data as pits and lands that are read using a laser. CD-ROMs organize data into sectors along a spiral track to take advantage of all storage space.
Magnetic storage devices
Bilal Maqbool submitted an assignment on magnetic storage devices to his professor Sir. Shujahat Hussain at the University of Azad Jammu & Kashmir on February 8, 2012. The assignment discussed different types of magnetic storage devices including hard disks, floppy disks, magnetic tape, and magnetic drums. It also covered the basic principles of how magnetic storage works by polarizing iron particles on a disk's surface to represent binary data.
Storage devices
This document discusses different types of storage devices. It describes three major technologies for computer storage: magnetic, optical, and flash memory. Magnetic storage includes internal and external hard disks, which use magnetic platters and read/write heads. Optical storage uses CDs and DVDs in read-only, write-once, or read-write formats. Flash memory storage includes cards like CompactFlash, SD cards, and USB flash drives.
Unit1 three part secondary storage devices
This document discusses secondary storage devices. It begins by introducing secondary storage and its advantages over primary storage, such as virtually unlimited capacity and lower cost per bit. It then classifies common secondary storage devices as either sequential access (e.g. magnetic tape) or direct access (e.g. magnetic disks). The document proceeds to describe the basic principles, organization, storage capacity, and uses of popular sequential and direct access devices like magnetic tapes, magnetic disks, and optical disks.
Secondary Storage
Secondary storage, such as hard disks, floppy disks, optical disks, magnetic tapes, and online storage, provides large storage capacities and reliability compared to primary storage/memory. It allows permanent storage of software, data, and files. Benefits include vast storage capacities, reliability since data is safe from tampering, convenience of quick data access, and lower costs than paper filing systems. Data is organized on disks through methods like sectors and cylinders to efficiently store information.
348584 634041800402750000
This document discusses when to use comparative and superlative adjectives. It explains that the comparative form is used to compare two things, while the superlative compares three or more things. It then provides rules for forming the comparative and superlative of adjectives based on their number of syllables and ending letters. Adjectives with one syllable typically add "-er" for comparative and "-est" for superlative. Two syllable adjectives ending in "y" change the "y" to "i" before adding "-er" or "-est". All other two+ syllable adjectives add "more" or "the most" instead of changing the word.
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This presentation discusses magnetic tapes as a secondary storage device. It explains that magnetic tapes use a thin, magnetizable coating on a plastic film to store data in tracks and records that are accessed by a read-write head. Magnetic tapes provide serial access storage and can store up to 29.5GB per square inch, more than a dual-layer Blu-ray disc.
Secondary storage devices
Secondary storage devices include floppy disks, hard disks, CDs, DVDs, Blu-ray discs, pen drives, and memory cards. These are non-volatile storage options that operate alongside primary storage like RAM. Floppy disks store data on magnetic coated plastic plates divided into tracks and sectors, while hard disks use metal plates for higher capacity. Optical discs like CDs, DVDs, and Blu-rays encode data through laser etching in pits arranged in a tight spiral, allowing greater storage densities over time. Portable options include pen drives with removable flash memory and memory cards commonly used in cameras, phones, and other electronics.
Secondary Storage
Floppy disks, tapes, zip disks, and hard disks are examples of different storage media that vary in size, storage capacity, accessibility, and portability. Floppy disks have low storage capacity and portability while hard disks have high storage capacity but low portability. Storage media can be optical like CDs, DVDs, or magnetic like floppy disks, hard drives, zip disks, and tapes. Magnetic media uses magnetism to store data and can be accessed directly or sequentially, while optical media uses lasers to read binary data encoded as pits on the storage surface. Flash memory is a type of solid-state circuit media that can be electrically erased and rewritten in blocks.
Magnetic tape
Magnetic tape consists of a thin plastic ribbon coated with magnetic material that can be magnetized to store binary data in sequential tracks and frames, allowing it to serve as a primary means of backup and data transfer between systems in a cost effective manner. Magnetic tape uses tape heads with electromagnetic coils and ferromagnetic cores to magnetize the coating and read the magnetic patterns representing stored data. While magnetic tape provides high storage capacity at low cost and is suitable for batch processing, it also has disadvantages such as slow data transfer rates and inability to randomly access specific data.
Chapter 8 - Multimedia Storage and Retrieval
This is the subject slides for the module MMS2401 - Multimedia System and Communication taught in Shepherd College of Media Technology, Affiliated with Purbanchal University.
Backing storage
Backing storage refers to permanent storage devices like hard drives and USB flash drives that are used to save files and data when the computer is switched off. Magnetic storage devices like hard disk drives store data using magnetization on metal disks, allowing for high storage capacities. Hard drives are fixed internally while portable external drives also exist. Magnetic tape is used for backups due to low cost and ability to store terabytes of data sequentially. Solid state devices have no moving parts and include USB flash drives and memory cards used in cameras and phones, providing portable storage up to 512GB. Optical storage technologies like CDs, DVDs use lasers to burn pits and lands encoding data, with read-only, write-once, and rewritable
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This document provides an overview of secondary storage devices, including magnetic storage devices like magnetic tapes, hard disks, and floppy disks. It also discusses optical storage devices such as compact discs, digital versatile discs, and Blu-ray discs. Finally, it covers flash drives. The document describes the basic components and features of these various storage technologies and how they work to store digital data.
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The document discusses the history and evolution of computer hardware from the first generation of vacuum tube computers to current generation computers using grand-scale integrated circuits. It describes the main components of computer hardware including the central processing unit, primary and secondary storage, and input/output devices. It also covers topics such as computer memory, microprocessors, and emerging technologies.
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This presentation discusses various storage devices used in computing. It describes primary storage devices like RAM and ROM that provide temporary data storage and access. Secondary storage devices like hard disk drives, solid state drives, optical discs (CDs, DVDs, Blu-Rays), magnetic tapes, and USB flash drives provide permanent and portable data storage. The presentation covers the basic working, types, advantages and disadvantages of these common storage devices.
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Secondary storage devices are non-volatile memory that stores large amounts of data at lower costs than primary memory. There are two main types of secondary storage devices: sequential access devices like magnetic tapes that are very fast for sequential data but slow for random access, and direct access storage devices (DASDs) like hard disks that allow for high-capacity random access storage. Magnetic disks are the most widely used secondary storage, offering high storage capacity, reliability, and the ability to directly access stored data.
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This document defines and describes several types of storage media devices including discs (CD, DVD, floppy), flash memory cards (SD, MMC, xD), and tape drives. It provides details on the size, storage capacity, intended use, and other specifications for each type of media.
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The document discusses different types of secondary storage devices. It describes sequential access devices like magnetic tapes that read and write data sequentially. It also describes direct access devices like hard disks that allow random access to stored data. Hard disks, floppy disks, disk packs, and zip disks are examples of magnetic disks. Optical disks like CDs, DVDs, and Blu-ray disks are also covered. Each type of secondary storage device has advantages and limitations in terms of storage capacity, access speed, portability and reusability.
Secondary Storage Devices
Secondary storage devices such as hard disks, CDs, USB drives, and Blu-ray discs are used for bulk storage of data with large capacities and transfer data to main memory for processing. Hard disks provide fast storage and high capacities, storing data on magnetic disks accessed by read/write heads. CDs and Blu-ray discs use optical technology to store digital data in pits encoded in spiral tracks, with Blu-ray using a blue laser to achieve higher densities. USB drives are portable flash memory devices that can easily transfer data between computers. Secondary storage is cheaper than main memory and has slower access times.
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Secondary storage is required for computers for three reasons: primary storage is volatile, has limited capacity, and is more expensive than secondary storage. Secondary storage includes magnetic media like hard disks and floppy disks, as well as optical media like CDs and DVDs. These devices store large amounts of data permanently but are not directly accessible by the CPU, so they have slower access times than primary storage.
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Secondary Storage DevicesWe Learn - A Continuous Learning Forum from Welingkar's Distance Learning Program.
Secondary storage devices are used to store data semi-permanently as primary storage is volatile. Common secondary devices include floppy disks, hard disks, CDs/DVDs, pen drives, and magnetic tapes. Floppy disks use magnetic material coated plastic disks to store data in tracks and sectors, allowing direct access. Hard disks have multiple rigid platters that spin rapidly, containing data on both sides. Data is read and written by heads positioned very close to surfaces. Pen drives use flash memory and a USB interface for portable storage. DVDs can store more data than CDs due to higher density encoding and multilayer capabilities.Secondary storage devices
The document summarizes secondary storage devices, including magnetic disks and optical disks. Magnetic disks store data on circular platters that rotate rapidly. Data is written to and read from the disks using read/write heads. Disks are organized into tracks, sectors, cylinders, and clusters. Accessing data involves seek time, rotational latency, and transfer time. Optical disks like CD-ROMs encode data as pits and lands that are read using a laser. CD-ROMs organize data into sectors along a spiral track to take advantage of all storage space.
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Bilal Maqbool submitted an assignment on magnetic storage devices to his professor Sir. Shujahat Hussain at the University of Azad Jammu & Kashmir on February 8, 2012. The assignment discussed different types of magnetic storage devices including hard disks, floppy disks, magnetic tape, and magnetic drums. It also covered the basic principles of how magnetic storage works by polarizing iron particles on a disk's surface to represent binary data.
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This document discusses different types of storage devices. It describes three major technologies for computer storage: magnetic, optical, and flash memory. Magnetic storage includes internal and external hard disks, which use magnetic platters and read/write heads. Optical storage uses CDs and DVDs in read-only, write-once, or read-write formats. Flash memory storage includes cards like CompactFlash, SD cards, and USB flash drives.
Unit1 three part secondary storage devices
This document discusses secondary storage devices. It begins by introducing secondary storage and its advantages over primary storage, such as virtually unlimited capacity and lower cost per bit. It then classifies common secondary storage devices as either sequential access (e.g. magnetic tape) or direct access (e.g. magnetic disks). The document proceeds to describe the basic principles, organization, storage capacity, and uses of popular sequential and direct access devices like magnetic tapes, magnetic disks, and optical disks.
Secondary Storage
Secondary storage, such as hard disks, floppy disks, optical disks, magnetic tapes, and online storage, provides large storage capacities and reliability compared to primary storage/memory. It allows permanent storage of software, data, and files. Benefits include vast storage capacities, reliability since data is safe from tampering, convenience of quick data access, and lower costs than paper filing systems. Data is organized on disks through methods like sectors and cylinders to efficiently store information.
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Secondary storage devices store information even when a computer is powered off. Common secondary storage devices include floppy disks, hard disks, magnetic tapes, flash drives, and optical disks. Magnetic tapes and disks are sequential access devices that read/write data in sequence, while hard disks and optical disks are direct access devices that allow random access to data. Secondary storage provides large storage capacity at lower costs than primary storage and is used to store programs and data.
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The document provides an overview of different types of secondary storage devices, including magnetic tape, magnetic disks, and optical disks. It discusses the key characteristics of each type of device, such as sequential versus direct access, storage capacity, cost per bit, advantages and limitations. Magnetic tape is well-suited for sequential access of large datasets but has limitations around environmental storage conditions. Magnetic disks provide direct random access and are commonly used for online storage due to their lower cost relative to storage capacity. Optical disks have very high storage density and are ideal for read-only distribution of data but cannot be erased.
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This documentation is made for my final year project , on Data Storage in DNA.-
contains--------------------
Introduction
History
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Proposed System
Working of DNA Digital Data
Advantages
Disadvantages
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This document discusses different types of secondary storage devices and their characteristics. It begins by explaining the limitations of primary storage and need for secondary storage. It then classifies commonly used secondary storage devices as sequential-access devices like magnetic tapes and random-access devices like magnetic disks. Specific device details covered include half-inch tape reels, tape cartridges, floppy disks, hard disks, CDs, DVDs, flash drives and memory cards. The document concludes by presenting the storage hierarchy from fastest and most expensive to slowest and least expensive storage.
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The document discusses various methods for storing and retrieving images, including tape drives, hard disks, optical discs like CDs and DVDs, and removable media like zip disks. It describes the basic technology behind each storage type, their capacities and transfer speeds, common formats, and advantages and limitations. Tape drives provide large storage capacities but slow sequential access, while hard disks and optical discs offer faster random access but have more limited capacities. Removable disks like zip disks also provide portable storage.
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This document discusses using DNA for digital data storage. It provides background on DNA and how digital data can be encoded in DNA sequences. Key advantages of DNA storage include extremely high storage density, longevity, and security. Challenges include slow retrieval speeds and high costs. Recent developments show promise, such as Microsoft demonstrating storing 200 MB of data in a single drop of liquid DNA. DNA may provide vastly more efficient long-term storage than current technologies.
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The document discusses and compares various types of secondary storage devices. It describes magnetic tape, floppy disks, hard disks, CD-ROMs, DVDs, and memory sticks. Magnetic tape provides archival storage but only allows sequential access. Floppy disks allow portability but have limited capacity. Hard disks have high storage capacity and access speeds but are not portable. Optical disks like CDs and DVDs can store large amounts of data reliably but have slower access times than hard drives.
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S tora ge devices
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Secondary storage devices are used to store and retrieve data outside of the computer's main memory. They include internal hard drives and removable media like USB drives, CDs, DVDs, and tapes. Secondary storage saves data permanently, allows portability between devices, and comes in various sizes and formats. Common types discussed are fixed internal hard drives using magnetic disks, removable optical disks like CDs and DVDs, magnetic tapes for backups, and floppy disks which were an early portable storage type but have been replaced by higher capacity devices.
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Hafiz sarfraz ali presentation final
- 2. LAHORE LEADS UNIVERSITY NAME : SARFRAZ ALI. Registration : 1046-BSCS (A)
- 3. Types of Magnetic Tapes. Advantages of Magnetic Tapes. Limitations of Magnetic Tapes. Uses of Magnetic Tapes.
- 4. The tapes which store data due to magnatictivty . There are Four types of magnetic tapes.
- 5. i- 1/2 – inch tape real. ii- 1/ 2 – inch tape cartridge. iii- 1/4 - inch tape real. iv- 4-mm digital audiotape(DAT)
- 6. 1. ½ inch tape ribbon 2. Having Read/Write used for storage. Memory. 3. Single unit having 4. Information store one read and write Independently in parallel head for each track. edge of the tape. 5. Data store in adjacent bit configuration is known as parallel representation .
- 7. 1. Data tapes was fat Difficult storing process. 2. Data cartridges is easier to use and cheaper.
- 8. Look like VCR’s. Large size. Packed in a cover. Safe from Dirt
- 9. Sequential data storage, process program. Having Data Back-up. Store Data under environment like temperature .
- 10. DAT provides very high data density per inch of tape. The tape length is either 60 meters or 90 meters . Very high data recording density is obtained by using a special technique for data recording.
- 11. Unlimited storage. Low cost and High Data Storage in small space. Easily portable from one place another. Not Linked Together with multi program.
- 12. Access Nature is not suitable for Data storage. Keep in Dust Free Environment, normal temperature. Use Label Properly.
- 13. Sequential Data Processing. Data backup-Stored online. Transfer b/w two computer not link together. Distribution of software by vendors.