Whenever the computer is turned off the contents of primary storage (RAM) are lost . But the contents of secondary storage remain unaffected. For secondary storage , the obvious choice is floppy disks , CD / DVDs, and hard disks . In addition, you can also use tapes for secondary storage. A floppy disk or hard disk consists of a plastic plate on which the material that can be magnetized is glued. The working of floppy disk or hard disk is some what similar to that of audio or video tapes.
A few years ago, floppy disks used to come in two sizes : 5.2 - inch and 3.5-inch . But now 5 . 25 - inch floppy disks are almost non existent. In computers, one kilo means not 1000 but 1024 . Also notice the following relations:
1 Kilo * 1 kilo = 1 mega
1 Kilo * 1 mega =1 giga
A floppy disk also consists of a label area and a write protect notch. Write floppy number, and other information on the label area . Write protect noch is provided so that you can prevent the accidental erasure of data in the disk. In order to write protect the 3.5-inch disk, slide the tab so that a square hole is formed on the disk. When you want to write on this disk then again slide the tab to its original position so that square hole gets covered by the tab So this is all about the computer secondary storage- disks.
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