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E0001 Computers in Engineering Secondary storage
Readings zShelly 1999 - Chapter 6 zShelly 1997 - Chapter 5 zShelly 1995 - Chapter 6 zMeyer 1997 - Chapter 2B zMeyer 1995 - Chapter 2B
zFloppy disks zHard disks zOptical discs zMagnetic Tape Types of Secondary Storage
Tracks and Sectors
Floppy Disk Capacity z3 1/2 inch ydouble sided; double density - 720kB ydouble sided ; high density - 1.44MB z5 1/4 inch ydouble sided; double density - 360kB ydouble sided ; high density - 1.2kB
Storage terms zkilobyte - KB - 1000 bytes zmegabyte - MB - 1000 000 bytes zgigabyte - GB - 1 000 000 000 bytes zterrabyte - TB - 1000 000 000 000 bytes
Care of disks
How a disk drive works z360 revolutions per minute zread-write heads zaccess arm zseek and search operation zaccess time
How data is stored
Hard disks zinternal disks zhard disk cartridges zhard disk packs
Performance Enhancements zdisk caching zdata compression and decompression zRAIDS - redundant arrays of inexpensive disks (RAIDs)
Optical discs z650 MB of data zlaser beam zthree kinds yCD-ROM yCD-R yerasable optical discs
Magnetic Tape zStreamers ycartridge unit ydigital audiotape (DAT) zReels
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