W7Lect - WHAT IS Secondary Storage? Primary vs. Secondary...

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WHAT IS Secondary Storage?
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Primary vs. Secondary Storage Primary storage is traditionally temporary - e.g. on-board RAM- and volatile Secondary / auxiliary storage is permanent e.g.
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Secondary Storage On tape, disk, optical and lately flash memory sticks, smart, compact, etc. NON-Volatile. Permanent or semi-permanent . Direct representation of Contents, Image and Pattern of original.
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Method’s of Accessing Secondary Storage TAPE - sequential access DISK - random access DRUM – random access CD, DVD FLASH STICKS - random access - emulates disk storage Credit cards
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On Floppy drives How to I tell the first drive from the second? With floppy drives, the position on the cable determines whether the drive is A: or B: A: is at the end of the cable (after the twist) b: is the middle drive
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FLASH memory In-circuit wiring Blocks usually 512 bytes in size FAST 7 Nsec to read. 10 Nsec to write. Retains its DATA. Evolving technology Miniaturization Capacity
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Magnetic Media Disk Definition Function Requirements Preparation
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Definition A disk drive is a device used for data storage. Contains disk-shaped platters constructed of aluminum, glass or Mylar film. One read / write head per platter side.
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This note was uploaded on 04/14/2011 for the course HWD 101 taught by Professor Brain during the Spring '11 term at Seneca.

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W7Lect - WHAT IS Secondary Storage? Primary vs. Secondary...

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