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E0001 Computers in Engineering Secondary storage.

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Presentation on theme: "E0001 Computers in Engineering Secondary storage."— Presentation transcript:

1 E0001 Computers in Engineering Secondary storage

2 Readings zShelly Chapter 6 zShelly Chapter 5 zShelly Chapter 6 zMeyer Chapter 2B zMeyer Chapter 2B

3 zFloppy disks zHard disks zOptical discs zMagnetic Tape Types of Secondary Storage

4 Floppy Disks

5 Tracks and Sectors

6 Floppy Disk Capacity z3 1/2 inch ydouble sided; double density - 720kB ydouble sided ; high density MB z5 1/4 inch ydouble sided; double density - 360kB ydouble sided ; high density - 1.2kB

7 Storage terms zkilobyte - KB bytes zmegabyte - MB bytes zgigabyte - GB bytes zterrabyte - TB bytes

8 Care of disks

9 Head clearance

10 How a disk drive works z360 revolutions per minute zread-write heads zaccess arm zseek and search operation zaccess time

11 How data is stored

12 Hard disks zinternal disks zhard disk cartridges zhard disk packs

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14 Performance Enhancements zdisk caching zdata compression and decompression zRAIDS - redundant arrays of inexpensive disks (RAIDs)

15 RAID system

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17 Optical discs z650 MB of data zlaser beam zthree kinds yCD-ROM yCD-R yerasable optical discs

18 Magnetic Tape zStreamers ycartridge unit ydigital audiotape (DAT) zReels

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