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Word Count: 449
1 The main function of secondary storage is to store programs and data when they are not being used 2 secondary storage is used to store data that is not being used 3 The most widely used form of secondary storage is magnetic disks because they are nonvolatile 4 They are portable inexpensive lightweight nonvolatile and easily accesible 5 It must be formatted formatting defines the disk surface and erases any pre-existing data It also scans the disk for any defects 6 1 the recording density 2 the number of tracks on the disk 7 Access time is the time required to access and retrieve data This time is made up of three functions seek time - the time taken for the readwrite head to get in place Rotational delay - Time taken for the part of disk with required info to spin under the head Data transfer rate - tim taken for data to get from the disk to the main memory 8 8 inch floppy disks 5 inch floppy disks 35 inch floppy disks - all three have a plastic outer casing with a thin mylar disk coated with an oxide HD high density 35 inch floppy disks can store more data 144MB Floptical disks use both optical and magnetic technology to store much larger amounts of data approx 2 GB 9 Floppy disks have a plastic casing containing a single disk as opposed to a rigid platter containing several 10 Hard disks have easier access and larger and faster storage capacity than diskettes 11 RAIDis a system that has faster access Zip drive portable Memory button easy to use 12 Data compression reduces storage size by substituting codes for repeating patterns It is used so less memory on your computer is used 13 To prevent the loss of disk data 14 To reorganise data so that is in contiguous clusters 15 Magnetic tape is used primarily for backup for medium to large
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