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How Is Data Stored Electronically And By What Method?

889 words - 4 pages

Definitions of storage:The number of instructions and amount of data a computer can store in its memory is measured in bytes. One byte contains 8 bits (short for binary digits, 0 and 1). Computers work by using pulses of voltage which represent either 0 or 1. Low voltages represent 0, high voltages represent 1. 8 bits are normally needed to store one character. A single character can be stored in one byte. We normally refer to storage capacities in terms of kilobytes (KB) or megabytes (MB).1 KB = 1 kilobyte = 1024 bytes1 MB = 1 048 576 bytes1 GB = 1 gigabyte = 1000 MBMemory (main store) and how it can be used:There are two types of memory or main store:read-only memory (ROM)random-access ...view middle of the document...

ROM is often referred to as non-volatile memory.EPROM:EPROM stands for erasable programmable read-only memory. This is a memory chip whose contents are normally fixed. However, the chips may have its contents erased by the actions of ultra-violet light and may then be reprogrammed.Random Access Memory:RAM is again held on a chip but data in RAM is held only temporarily, which means that the data disappears when the power is switched of. For this reason, RAM is often called volatile memory. RAM is used to hold both data and programs during processing. Both RAM and ROM are often referred to as immediate access store.Backing Stored media:Floppy Disks:The inside floppy disk is magnetic. The magnetic disk stores binary data as a magnetic pattern on the disk surface. Disks must be looked after and some things must be avoided, like hot or magnetic surfaces. A typical 3.5 inch floppy disk holds 1.44 MB if data. Before data is stored on the disk, the disk needs to be formatted. This creates a magnetic map of the disk surface to enable the data to be either read form the disk or written onto the disk quickly.Hard disks:Hard drives usually consist of several disks on a single spindle. Each disk surface is able...

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