1. 3 Storage devices and media Backing store devices

2. 3 Storage devices and media DeviceCharacteristicsPicture/ diagram Hard disk Floppy disk Magnetic tape Tape streamer CD-ROM (?) Built into the computer at manufacture. Has very high capacity. Cheap. Usually called drive c: on your home computer. Small, portable disk. Capacity limited to 1.44Mb. Very cheap. Convenient for transferring data from one computer to another. Very high capacity. Reels of tape can be of varying sizes. Very cheap but slow transfer speeds. Used for backups. Again a very cheap, high capacity medium. Used for backups. Fast transfer. Compact size. Very high capacity optical storage disk eg DVD. Fast transfer of data. Problem is the ability to rewrite to same disk. Often known as WORM medium.

3. 3 Storage devices and media Backing Store A device that can be used to store information permanently. It is usual to be able to read and write to this medium as often as needed. Magnetic disks and tape are the main examples, but could also include CD-ROM. Hard diskAs from previous notes Floppy diskAs from previous notes Tape streamerAs from previous notes CD ROMAs from previous notes WORM Write Once Read Many. Applies to CD-ROM and other optical disk technology where once the data has been written it is permanent. For your dictionaries….