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Storage Devices

Storage Devices. Magnetic Storage Optical Storage Digital Storage. Magnetic Storage Devices. Surface is coated with magnetically sensitive material that reacts to a magnetic field. Types: Floppy Disks (Diskettes) Hard Disks External High Capacity Floppy Disks

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Storage Devices

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  1. Storage Devices • Magnetic Storage • Optical Storage • Digital Storage

  2. Magnetic Storage Devices Surface is coated with magnetically sensitive material that reacts to a magnetic field. Types: Floppy Disks (Diskettes) Hard Disks External High Capacity Floppy Disks External Hard Disks (Disk Cartridges) Tape Drives

  3. Floppy Disks (Diskettes) --must be formatted divided into tracks and sectors --random access--can access any one spot without scanning through all data --capacity of 720KB to 1.44 MB --spin at 300 rpm

  4. Hard Disks --also has tracks and sectors --a stack of rigid disks; sealed --read/write head extremely close, but not touching --newest ones can store up to 256-320 GB --spin at 15,000 rpm

  5. External High Capacity Floppy Disks --approximately size of floppy disk --needs drive added --Examples—Zip disks, SuperDisks & HiFD disks --hold up to 750MB (equal to 520 floppy disks)

  6. External Hard Disks(Disk Cartridges) --removable hard disk --some are PC Cards special adaptor to slide card into --example—Jaz disk --up to 500 GB

  7. Tape Drives --work like audiocassette --sequential access --used mainly for back-up --up to 800 GB if compressed --inexpensive alternative

  8. Optical Storage Devices Store data on a reflective surface so it can be read by a beam of laser light. Types: CD-ROM DVD-ROM CD-R (CD-Recordable) CD-RW (CD-ReWritable) Photo CD DVD-R (DVD-Recordable) DVD-RAM

  9. CD-ROM --compact disk-read-only memory --can be “read” many times, but not changed --same technology as music CDs --Laser senses whether laser is reflecting or scattering light (reflect = 1; scattering = 0) --holds up to 700 MB of data or 80 min. of audio --slower retrieval rate than a hard disk

  10. DVD-ROM --digital video disk read-only memory --can be “read” many times, but not changed --large capacity due to using both sides of the disk & using special data compression technology --two-sided = capacity up to 9.4 GB (or 17 GB if double-sided & double-layered) --these drives can play CD-ROMs & audio CDs --newest ones may have multiple layers

  11. CD-R (CD-Recordable) --may create your own CDs (data or audio) --once recorded, cannot be changed

  12. CD-RW (CD-ReWritable) --can write data, then overwrite it with new data --most can be overwritten up to 100 times --may not play on every CD-ROM drive --most cannot store audio data

  13. Photo CD --recordable CD that stores digitized photographs --images viewed from CD-ROM drive --images cannot be erased or changed --can continue to add new images until full --can paste images into other documents

  14. DVD-R (DVD-Recordable) --may create your own DVDs --once recorded, cannot be changed

  15. DVD-RW (DVD-Rewritable)or DVD-RAM --may record, erase and re-record data --DVD-RAM drives can read DVDs, DVD-R disks, CD-R disk, CD-RW disks and standard CDs.

  16. Digital Storage Devices Store data in digital form on a memory chip Types: Memory Sticks USB Portable Flash Drives SD Cards XD Cards Compact Pen Drives

  17. Examples of Digital Storage Devices Up to 16 GB

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