M

MAU (media access unit or media attachment unit)

Mb (megabit) 1,000,000 bits

MB (megabyte) 1,000,000 bytes

MBR (master boot record)

MC (microcartridge)

MCA (MicroChannel Architecture)

MCH (memory controller hub)

MCM (multichip module)

MFM (modified frequency modulation)

MFT (master file table)

MHz (megahertz)

Mib (mebibit) 1,048,576 bits

MiB (mebibyte) 1,048,576 bytes

MIC (Memory in cassette)

MIDI (musical instrument digital interface)

MMC (MultiMediaCard)

MMU (memory management unit)

MMX (multimedia extensions or matrix math extensions)

MNP (Microcom Networking Protocol)

MO (magneto-optical)

modem (modulator/demodulator)

MOV (metal-oxide varistor)

MPEG (Motion Picture Experts Group)

MPS (Multiprocessor Specification)

MR (Microid Research)

MRH-R (memory repeater hub RDRAM-based)

MRH-S (memory repeater hub SDRAM-based)

MS (Microsoft)

MS-DOS (Microsoft disk operating system)

MSAU (multistation access unit)

MTBF (mean time between failures)

MTH (Memory translator hub)

MTTF (Mean time to failure)

MVA (multidomain vertical alignment)