Storage devices
This lesson includes the following sections:
Categorizing Storage Devices
Magnetic Storage Devices
Optical Storage Devices
Storage devices hold data, even when the computer is turned off.
The physical material that actually holds data is called a storage medium. The surface of a floppy disk is a storage medium.
The hardware that writes data to or reads data from a storage medium is called a storage device. A floppy disk drive is a storage device.
The two primary storage technologies are magnetic and optical.
Diskettes (floppy disks)
Hard disks
High-capacity floppy disks
Disk cartridges
Magnetic tape
Compact Disk Read-Only Memory (CD-ROM) A magnetic disk's medium contains iron particles, which can be polarized—given a magnetic charge—in one of two directions.
Each particle's direction represents a 1 (on) or 0 (off), representing each bit of data that the CPU can recognize.
A disk drive uses read/write heads containing electromagnets to create magnetic charges on the medium.
Digital Video Disk Read-Only Memory
(DVD-ROM)
CD-Recordable (CD-R)
CD-Rewritable (CD-RW)
PhotoCD
Storage devices
This lesson includes the following sections:
Categorizing Storage Devices
Magnetic Storage Devices
Optical Storage Devices
Storage devices hold data, even when the computer is turned off.
The physical material that actually holds data is called a storage medium. The surface of a floppy disk is a storage medium.
The hardware that writes data to or reads data from a storage medium is called a storage device. A floppy disk drive is a storage device.
The two primary storage technologies are magnetic and optical.
Diskettes (floppy disks)
Hard disks
High-capacity floppy disks
Disk cartridges
Magnetic tape
Compact Disk Read-Only Memory (CD-ROM) A magnetic disk's medium contains iron particles, which can be polarized—given a magnetic charge—in one of two directions.
Each particle's direction represents a 1 (on) or 0 (off), representing each bit of data that the CPU can recognize.
A disk drive uses read/write heads containing electromagnets to create magnetic charges on the medium.
Digital Video Disk Read-Only Memory
(DVD-ROM)
CD-Recordable (CD-R)
CD-Rewritable (CD-RW)
PhotoCD
RAM(Random Access memory) is a volatile memory.RAM is our working memory storage. All the data, which the PC uses and works with during operation, are stored here. Data are stored on drives, typically the hard drive. However, for the CPU to work with those data, they must be read into the working memory storage, which is made up of RAM chips.
Historical review:
Back in the 80's, PC's were equipped with RAM in quantities of 64 KB, 256 KB, 512 KB and finally 1 MB. Around 1990, advanced operating systems, like Windows, appeared on the market, that started the RAM race. The PC needed more and more RAM. That worked fine with the 386 processor, which could address larger amount of RAM. The first Windows operated PC's could address 2 MB RAM, but 4 MB soon became the standard. The race has continued through the 90's, as RAM prices have dropped dramatically. Today it would be foolish to consider less than 64 MB RAM in a PC. The OS like windows Xp requires better than this.
In this presentation, I have mentioned that what is CD (Compact Disk) and What is DVD. How data stores into it. And How it manufactures. And Difference between them.
RAM(Random Access memory) is a volatile memory.RAM is our working memory storage. All the data, which the PC uses and works with during operation, are stored here. Data are stored on drives, typically the hard drive. However, for the CPU to work with those data, they must be read into the working memory storage, which is made up of RAM chips.
Historical review:
Back in the 80's, PC's were equipped with RAM in quantities of 64 KB, 256 KB, 512 KB and finally 1 MB. Around 1990, advanced operating systems, like Windows, appeared on the market, that started the RAM race. The PC needed more and more RAM. That worked fine with the 386 processor, which could address larger amount of RAM. The first Windows operated PC's could address 2 MB RAM, but 4 MB soon became the standard. The race has continued through the 90's, as RAM prices have dropped dramatically. Today it would be foolish to consider less than 64 MB RAM in a PC. The OS like windows Xp requires better than this.
In this presentation, I have mentioned that what is CD (Compact Disk) and What is DVD. How data stores into it. And How it manufactures. And Difference between them.
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Workshop #3: Sketching Collaboratively by Praneet Koppulaux singapore
UX design is not a job to be done in silos anymore, designers are tasked with guiding the teams they work with to make better choices for the sake of the users. They need to work collaboratively with stakeholders/team members to integrate and understand business requirements and technology feasibility while advocating for the user. Time has come to repurpose some of the core UXers’ tools and methods for a collaborative and lean environment to build a shared understanding and work towards common product goals.
In this workshop, you will be introduced to collaborative sketching exercises. You will learn how to run such exercises to ideate, develop and iterate on possible design solutions with the development and management teams they work with.
2. Asalamualik
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My Name Is Raza Umer.
BSCS Section 1A Roll No. 1027
3. Mass Storage Devices.
Mass storage device are storage system having storage
capacity of several trillions of bytes of data.
They use multiple units of a storage media (such as
multiple disks, multiple tapes, multiple CD-ROMs,
etc.) as a single storage devices.
4. Disk array using a set of megnetic disk.
Automated tape library using a set of megnetic
tapes
CD-ROM jukebox using a set of CD-ROMs.
5. Disk array.
A disk array is a disk storage system which contains multiple disk drives.
A disk array is commonly known as a RAID (Redundant
Array of Inexpensive disk) .
As a secondary storage device, provides enhanced
Storage capacity, enhanced performance and enhanced
reliability.
Enhanced storage capacity is achieved by using multiple
disks.
Enhanced performance is achieved by using parallel data
transfer technique from multiple disks.
Enhanced reliability is achieved by using techniques such
as mirroring or striping.
6. In mirroring, the system makes exact copies of files on two hard
disks
In striping, a file is partitioned into smaller parts and different parts of
the file are stored on diffetent disks.
A RAID Unit
7. a) Set of magnetic tapes and magnetic tape drives with a controller
mounted in a single box, forming a single large storage unit.
b) Large tape library can accommodate up to several hundred
high capacity magnetic tapes bringing the storage capacity of
the storage unit to several terabytes.
c) Typically used for data archiving and as on-line data back up
devices for automated back up in large computer centers.
Automated Tape Library.
8. a) Set of CD-ROMs and CD-ROMs drives with a controller
mounted in a single box, forming a single large storage unit.
b) Large CD-Rom jukebox can accommodate up to several hundred
CD-ROM disks bringing the storage capacity of
the storage unit to several terabytes.
c) Used for archiving read-only data in such applications as on-line
museums, on-line digital libraries, on-line encyclopedia, etc
9. Storage Hierarchy.
Cache
Smaller capacity, memory
faster Main
memory Large capacity
Access time, and
On-line, direct access and Slower access time
higher
Sequential-acces secondory And lower cost per
Cost per bit stored
Storage devices such as hard disk Bit stored
Off-line direct access and sequential
Access secondary storage devices such as
Tape, floppy disk,zip disk etc.
Mass storage devices such as tape library, CD jukebox, etc.