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Secondary StorageChapter 8
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Competencies (Page 1 of 2)
Distinguish between primary & secondary storageDescribe the traditional floppy disk and compare it to high capacity floppy disksCompare internal hard disks, hard-disk cartridges, and hard-disk packs
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Competencies (Page 2 of 2)
Describe ways to improve hard-disk operations, including disk caching, redundant arrays of inexpensive disks, and data compression and decompression
Discuss the different types of optical disks; mass storage
Describe solid-state storage, Internet drives, and magnetic tape
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Storage
Primary storageVolatile
Temporary
Secondary storageNonvolatile
Permanent
Secondary storage characteristics
Media
Capacity
Storage devices
Access speed
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Secondary Storage Devices
Most desktop microcomputer systems have floppy disks, hard disks, and optical disk drives
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Traditional Floppy DiskAlso known as:
Diskettes
Floppies
Portable storage media
Floppy disk drives (FDD)
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High Capacity Floppy Disks
Known as a floppy-disk cartridge
Require special disk drives
Three well known typesZip disks
HiFD disks
SuperDisks
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Hard DisksUse thicker, metallic platters for storage
Faster than a floppy diskette
Large capacity
Sensitive instruments
There are three types of hard disks:Internal
Hard-disk cartridge
Hard-disk pack
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Materials that Cause a Head Crash
Head crash is a disaster for a hard disk
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Internal Hard Disk
Located inside system unit
Known as a fixed disk
Designated as the C drive
Advantages over floppies
Access speed
Capacity
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Optical Disks
Compact
Permanent storage
Laser beams reflect off pits
Two common typesCD
DVD
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Compact Disc
Optical format
From 650 MB to 1 GB capacity
Rotation speeds vary
Types Read only: CD-ROM
Write once: CD-R
Rewriteable: CD-RW
Picture CDs and Photo CDs
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Digital Versatile Disc
Digital Versatile Disk or Digital Video Disk (DVD)
Similar to CDs, but can store more data
TypesRead only: DVD-ROM
Write once: DVD+R; DVD-R
Rewritable: DVD+RW; DVD-RW; DVD-RAM
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Other Types of Secondary Storage
Solid-state storage
Internet hard drives
Magnetic tape
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Solid-State Storage
Flash memory cardsWidely used in notebook computers
Used to record MP3 music files
Key chain hard drives Key chain flash memory devices
Connects to a USB port
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Internet Hard Drives
Known as i-drive or online storage
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Magnetic Tape
External storage
Provides sequential accessInformation stored in sequence
Slower than disks which provide direct access
Magnetic tape streamers or tape cartridges used by both mainframes and microcomputers
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