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Glossary 177
MAH — Milliampere-hour(s).
M
B — Megabit(s); 1,048,576 bits.
MB — Megabyte(s); 1,048,576 bytes. However, when referring to hard-drive capacity,
the term is often rounded to mean 1,000,000 bytes.
M
BPS — Megabits per second.
MB
PS — Megabytes per second.
MBR — Master boot record.
MEMORY ADDRESS — A specific location, usually expressed as a hexadecimal
number, in the system’s RAM.
MEMORY MODULE — A small circuit board containing DRAM chips that connects to
the system board.
MEMORY — An area in your system that stores basic system data. A system can
contain several different forms of memory, such as integrated memory (ROM and
RAM) and add-in memory modules (DIMMs).
MH
Z — Megahertz.
MIRRORING — A type of data redundancy in which a set of physical drives stores data
and one or more sets of additional drives stores duplicate copies of the data. Mirroring
functionality is provided by software. See also guarding, integrated mirroring, striping,
and RAID.
MM — Millimeter(s).
MOTHERBOARD — See system board.
MS — Millisecond(s).
MS-DOS® — Microsoft Disk Operating System.
MT/
S — Million transfers per second.
NAS — Network Attached Storage. NAS is one of the concepts used for
implementing shared storage on a network. NAS systems have their own operating
systems, integrated hardware, and software that are optimized to serve specific storage
needs.
NIC — Network interface controller. A device that is installed or integrated in a
system to allow connection to a network.
NMI — Nonmaskable interrupt. A device sends an NMI to signal the processor about
hardware errors.
NS — Nanosecond(s).
NTFS — The NT File System option in the Windows 2000 operating system.