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Primary and secondary storage.

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Primary Storage, i.e. random access memory (RAM). This type of storage holds data and instructions that are being worked on. When the computer is switched off, the contents of RAM are lost. This is known as volatile storage. Secondary storage, such as hard disks, floppy disks, CD's, DVD and magnetic tape. This type of storage is non-volatile. Floppy disks The standard 31/2" floppy disk is a thin, flexible plastic disk coated in metal oxide enclosed in a rigid plastic casing. A standard high-density disk has a storage capacity of 1.44 Megabytes. A diskette consists of two surfaces, each of which contains typically 80 concentric circles called tracks. Each track is divided into sectors. ...read more.


Up to 650Mb of data can be stored in these disks. CD-ROMs use a laser beam to read the data from the rotating disk surface. The light reflected back is interpreted as data. Writeable CDs Writeable CDs are now available in two different formats - CD-R (CD Recordable) and CD-RW (CD-Rewritable). Recordable CDs and only be written on once whereas Writeable CDs can be written on many times. They are useful backup devices. DVD DVD-ROMs are becoming more popular than video types. They have more advantages than the CD-ROM. * They are much faster * They have a much higher capacity * They can also play standard CD-ROMs and audio CDs * They can hold up to 135 minutes of high quality video and CD quality sound. ...read more.


Application Storage Medium Distributing commercial software. CD-ROM Transporting data between two computers. Floppy Disks, CD-ROM, Zip disks Making back-up copies of important information. Jaz disks, DAT (Digital Audio Tape), Floppy disks Storing software and information that you don't need to access constantly. CD-ROM, DAT Copying information to give to someone else. Floppy disks, CD-ROM Zip Disks Look at www.howstuffworks.com to find out more information about storage devices, arrange the following storage media: a. In order of speed starting with the fastest. b. In order of storage capacity starting with the largest. a. * Hard disk * DVD * CD-ROM * Jaz disk * Zip Disk * Floppy disk b. * Hard disks * DVD * Jaz disks * CR-ROM * Zip disks * Floppy Disks Jennifer Masterton 11T Storage Devices ...read more.

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