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Storage devices in terms of computers.

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There are two types of storage systems in terms of computers: > Primary storage: is the storage provided by memory in a computer > Secondary storage: storage provided by peripheral devices other than memory Primary storage: Memory - The amount of memory in a computer system determines the level of complexity of task that the system can handle. A single unit of memory is called a bit. A bit can store 0 or 1. Eight bits together are called a byte. Memory, and data storage capacity is usually measured in larger units. There are two classes of memory in a computer system: > Ram: (random access memory) > Rom: (read only memory) RAM is memory that can be both read and written to. It is used for storing data and programs while the computer is being used. Most RAM is volatile, i.e. it can only hold data while power is supplied to the computer. Once the power is turned off the contents of ram are lost. System settings such as date and time are stored in CMOS (complementary metal oxide semiconductor) RAM. CMOS RAM has a battery to keep the data. ...read more.


They consist of a single removable drive with the same diameter of a standard floppy disk (3.5inches) The zip disks looks like a standard floppy disk, however it is much faster. The typical storage amount of a zip drive is 250mb. Its transfer rate is around 1.7Mb per second. Hard Drives: The hard drive is the main storage device of a computer. Your applications, games and everything else are stored here. Hard drives are big, fast and are stored onto the computer. The speed at which your computer boots up and programs loads is totally related to the performance of your hard drive. They are more secure and reliable than floppy's. Hard disks hold more data and are faster than floppy disks. A hard disk, can store anywhere from 10 to more than 100 gigabytes, whereas most floppies have a maximum storage capacity of 1.4 megabytes. The hard disk is capable of holding large amounts of data and it has a very high data transfer rate. Floppy Disks: Floppy disks are an important type of storage device. They have a low storage capacity (1.44mb), which means they are only suitable for transferring small files between computers as well as providing a back up for word-processing documents. ...read more.


CD-RW is a type of CD disk that enables you to write onto it in multiple sessions. CD-RW drives are readable and write able. This means that the information written on them today can be overwritten with new information tomorrow. Also, they can be read by any CD-ROM drive. CD-RW drives are very important because they allow you to share large amounts of data with other people. With CD-RW drives and disks, you can treat the optical disk just like a floppy or hard disk, by writing data onto it multiple times. CD-RW disks can be rewritten as many as 1000 times. Magnetic Tape: In magnetic tape, data is recorded in frames across the tape, with one frame representing one byte. The frame forms tracks along the length of the tape. Magnetic tape is a serial medium, which means that if you want to find an individual record you have to access it by starting at the beginning of the tape and reading through every record until the required one is found. Magnetic tape is cheap and convenient for backing up data as back ups are rarely used. Also they are considerably cheap compared to the amount of data they are able to hold. An average 7GB can be bought for under �10.00. ...read more.

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