Storage devices(present)

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Information about Storage devices(present)

Published on March 15, 2014

Author: zawawi90



discuss about computer storage device.
reference: comptia a+ book


• Storage device store information to be recalled and used at a later time • Storage device consists of: •Storage medium •Storage device • Three major technology types for information storage: •Magnetic •Optical or laser •Flash memory •Solid state 3/15/2014 2 SimNet Concepts Suppor CD: “Storage Concepts”

• Byte • Kilobyte (KB) • Megabytes (MB) • Gigabytes (GB) • Terabytes (TB) • Petabyte (PB) • Exabyte (EB) = 8 bits ≈ 1 Thousand Bytes ≈ 1 Million Bytes ≈ 1 Billion Bytes ≈ 1 Trillion Bytes ≈ 1 quadrillion Bytes ≈ 1 quintillion Bytes 3/15/2014 3

3/15/2014 4p. 5.142 & 5.144 Fig. 5.13 & 5.16

• Magnetic storage devices can be either internal or external • Internal magnetic hard disks are fixed inside the system unit • External magnetic hard disks are portable 3/15/2014 5SimNet Concepts Support CD: “Removable Disks”

• Internal hard disk is a magnetic storage device with • One or more thin platters that store information sealed inside the disk drive. • Read/write heads access the information on surface • Heads read information while copying it from disk to RAM • Heads write information when copying it from RAM to disk 3/15/2014 6

• External hard disks are magnetic storage media which are portable storage units that you can connect to your computer as necessary • Great for backup storage devices • Ability to transport your hard disk from one computer to another • Port used is USB and eSATA 3/15/2014 7

• Long term storage system and application software • Operating system and application software are copied from the hard disk to memory • Capacity measured in gigabytes and terabytes (160GB, 250GB, 500GB, 1TB, 2TB, 3TB) • Use Integrated Drive Electronic (IDE) and Serial Advanced Technology Attachment (SATA) port. • HDD speeds: 5400, 7200, 10000, 12000, 15000 (rpm)

• Like IDE, an I/O bus standard. • 7 types of cables: • DB-25 (SCSI-1) • 50-pin internal ribbon (SCSI-1, SCSI-2, SCSI-3) • 50-pin Alternative 2 Centronics (SCSI-1) • 50-pin Alternative 1 high density (SCSI-2) • 68-pin B-cable high density (SCSI-2) • 68-pin Alternative 3 (SCSI-3) • 80-pin Alternative 4 (SCSI-2, SCSI-3)

• A set of disk stations treated as one logical station • Data are distributed over the stations • Redundant capacity is used for parity allowing for data repair

• RAID 0 (disk stripping) • A stripped set of equal space from at least two drives creates a larger volume. • RAID 1 (disk mirroring) • Method of producing fault tolerance by writing all data simultaneously to two separate drives. • RAID 3 (Bit-Interleaved Parity) • Improves upon RAID 2 • Disk Controllers can detect whether a sector has been read correctly. • RAID 4 (block-interleaved parity) • Stripes data at a block level across several drives, with parity stored on one drive • Allows recovery from the failure of any of the disks • RAID 5 • combines benefit both RAID 0 and RAID 1

• A solid-state drive (SSD) is a data storage device that uses solid-state memory to store persistent data. • No Moving Parts. • Capacity: 32GB, 64GB, 128GB 240GB, 512GB • Use SATA port. 3/15/2014 13

Advantage Disadvantage More Durable Expensive Better Computer Performance - Faster Read and Write Speed - File Fragmentation Has Little Impact - Faster Boot Limited Storage Capacity Permanent Data Deletion Slower Write Speed on Some Models Produce less Noise Relatively Newer Technology Consume less Power Unreliable Life Expectancy Generate Little Heat Inability to Recover Lost Data 3/15/2014 14

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• Removable magnetic storage media come in two basic types: • Traditional floppy disks • Zip disks • These storage media are useful for: • Storing files for backup or security purposes • Transferring files from one computer to another 3/15/2014 16

• Floppy Mylar disk • Housed inside a hard plastic casing • Thin, flexible plastic disk • 3.5 inch floppy disks • also called floppies, diskettes, floppy disks • Holds about 1.44 megabytes of information • High-capacity disks • Zip® disk p. 5.144 Fig. 5.15

• High capacity plastic platter disk • Called removable hard disks • Provide a higher storage capacity than Mylar disks • Example - Zip® disk with capacity of 100MB, 250MB, and 750MB 3/15/2014 18

3/15/2014 19 DD = double density; HD = high density; ED = extended density

3/15/2014 20

• CDs • DVDs • Both are optical storage and have three formats: • Read-only • Write-once • Read-and-write

• Read-Only CD-ROM DVD-ROM • One-Time Writable CD-R DVD-R DVD+R • Fully Read-and-Write CD-RW DVD-RW or DVD+RW or DVD-RAM 3/15/2014 22 SimNet Concepts Support CD: “CDs and DVDs”

DVD+R DVD-R Pronounciation DVD plus R DVD dash R Backed by DVD+RW alliance (Sony, Yamaha, Philips, Dell, Microsoft etc.) DVD Forum (Apple, Pioneer , Mitsubishi, Hitachi, Time Warner etc.) Drag & Drop Yes, supported. This technology is code named Mt. Rainier and is a hardware feature. No, not supported. Layers Multiple Single Size 4 706 074 624 bytes (4488 MB) 4 706 074 624 bytes (4488 MB) 3/15/2014 23 Different DVD+R and DVD-R

• A Blu-ray Disc (also called BD) is a high- density optical disc format for the storage of digital information, including high-definition video. 3/15/2014 24

Format Characteristic DVD-ROM Purchased with data encoded; not able to change DVD-R, DVD+R Purchased blank; able to be written to once and then treated like a DVD-ROM DVD-RW, DVD+RW Purchased blank; able to be written to and erased multiple times DVD-RAM Purchased blank; able to be written to and erased just like a hard or floppy disk 3/15/2014 25

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• have high-capacity storage laminated inside a small piece of plastic • do not need a drive with moving parts to operate • Capacity: 32,64,128,268,512(MB) 1, 2, 4, 8, 16, 32, 64(GB) • Memory card need card reader to connect with computer. 3/15/2014 27

• CompactFlash (CF) • xD-Picture Card (xD) • SmartMedia (SM) Card • SecureDigital (SD) card and MultiMediaCards (MMC) • Memory Stick Media 3/15/2014 28

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