Computer Studies Today Chapter 18 1 »Two main types of secondary storage devices: –Magnetic...

Computer Studies Today Chapter 18

» Two main types of secondary storage devices:

– Magnetic storage devices

– Optical storage devices

Floppy Disks

» Data are organised on a floppy disk in rings called tracks.

» Each track is divided into sectors.

» A floppy disk drive allows data to be read from or written to a floppy disk.

Hard Disks

A hard disk and a hard-disk drive

A disk pack

» The mechanism for reading or writing data on a hard disk is similar to that of a floppy disk.

» The hard disk consists of several metallic platters and the drive has several access arms.

» The access arms move several read-write heads in and out between the hard disks.

» A way to organise data on a disk pack is the cylinder method.

» Materials that can cause a head crash.

» Hard disks have TWO advantages over floppy disks:

– Hard disks provide larger capacities than floppy disks.

– The access time for a hard disk is shorter.

» The access mode of magnetic disks (floppy disks and hard disks) is direct access.

» Data are recorded on or retrieved from the disks randomly.

Magnetic Tape

A cartridge tape and a cartridge tape unit

» Magnetic tape is the cheapest secondary storage medium and is suitable for storing a large amount of data.

» Data are recorded on or retrieved from the tapes sequentially.

Optical Disks

A CD-ROM driveOptical disks

» The access mode of optical disks is direct access.

» The storage capacity of optical disks is enormous and much larger than that of floppy disks.

» Comparisons between floppy disks, hard disks, magnetic tapes and optical disks:

Computer Studies Today Chapter 18 1 »Two main types of secondary storage devices: –Magnetic...

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