1. Introduction2. Types of Storage Device3. Primary Storage Device4. Types of Primary Storage Device5. Secondary Storage Device6. Types of Secondary Storage Device
1. Hardware device2. Holds information or store data3. Process data or information
There are mainly two types :-1. Primary Storage Device2. Secondary Storage Device
1. Temporary Storage Device,2. Volatile in most cases,3. Looses data when power is shut off…
There are mainly three types :-1. RAM2. ROM3. CACHE MEMORY..
1. Random Access Memory2. An integrated circuit made up of millions of transistor and capacitor.3. Volatile4. Two type - Static RAM [SRAM] Dynamic RAM [DRAM]
DRAM1. Volatile memory2. it requires stored information refreshed.. SRAM1. Volatile memory2. it never require refresh.
1. Read only memory2. non- volatile3. Three types – PROM , EPROM , EEPROM..
PROMProgrammable Read Only MemoryEPROMErasable Programmable ROMEEPROMElectrically Erasable Programmable ROM
1. Speed up the way application work2. called microprocessor3. fast memory4. more expensive then RAM
1. Permanent Storage Device,2. non-volatile,3. Doesn’t loose data when computer is turned off..
1. It is readable or writable2. It refers movable and backup storage3. It is permanent until changed by user..
There are mainly three types:-1. Magnetic Disks2. Optical Disks3. Magnetic Tapes..
1. Consist of magnetically coated disks2. Two types:- Hard Disk Drive, Floppy Disk..
1. Invented in 1950s.,2. Non-volatile,3. store data or information4. Use thicker, metallic platters for storage5. Large capacity
Floppy Disk Diskettes Flexible disk and Floppies The plastic disk inside the diskette cover is flexible Portable storage media Floppy disk drives (FDD) Disk surface to represent ones and zeroes. Characters are represented by positive + and – charges using ASCII code. 8- 22
High capacity Known as a floppy-disk cartridge Require special disk drives Three well known types ◦ Zip disks (Iomega) 100MB, 250MB, 750MB ◦ HiFD disks (Sony) 200MB, 720MB, read and store data on 1.44MB disk ◦ SuperDisks (Imation) 240MB, 120MB 8- 23
Compact Permanent storage Optical disk use reflected light. The 1s and 0s are represented by flat areas called lands and bumpy areas called pits. Two common types ◦ CD ( 650 MB to 1GB) ◦ DVD ( 4.7 GB to 17 GB) 8- 25
Optical format From 650 MB to 1 GB capacity Rotation speeds varyIt determines how fast data can be transferred from the CD24X or 24- speed CD drive can transfer 3.6 MB per second. Types ◦ Read only: CD-ROM ◦ Write once: CD-R ◦ Rewriteable: CD-RW ◦ Picture CDs and Photo CDs 8- 26
Digital Versatile Disk or Digital Video Disk (DVD) Similar to CDs, but can store more data Types ◦ Read only ◦ Write once ◦ Rewritable 8- 27
Solid-state storage Internet hard drives Magnetic tape 8- 28
New standard in storage Blu-Ray ◦ New disks use blue laser light instead of the red laser light used in traditional CD players ◦ Disks may ultimately hold Over 30GB on one-sided disks Over 50GB on two-sided disks 8- 29
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