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Megabyte

A unit of measurement equal to 1 million bytes or 1,024 kilobytes or 1,048,576 bytes.

Megahertz (MHz)

A measurement of frequency in millions of cycles per second.

Mirroring

A popular term for RAID-1. A method of creating disc-fault tolerance by redundantly storing information on a pair of drives.

Motherboard

Motherboard is the heart of your PC. It handles system resources (IRQ lines, DMA channels, I/O locations), as well as core components like the CPU, and all system memory. It accepts expansion devices such as sound and network cards, and modems.

MTBF

Acronym for mean time between failures. It is the reliability rating indicating the expected failure rate of a product in power on hours.