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Magnuson-Moss Act
The Magnuson-Moss Warranty Act is the federal law that governs consumer product warranties. Passed by Congress in 1975, the Act requires manufacturers and sellers of consumer products to provide consumers with detailed information about warranty coverage. In addition, it affects both the rights of consumers and the obligations of warrantors under written warranties.

Megabit
Amount of memory equal to 1,048,576 bits of information. (Abbreviated Mb.)

Megabyte
Amount of memory equal to 1,048,576 bytes of information. (Abbreviated MB.)

Megahertz
A measurement of clock cycles in millions of cycles per second.

Memory Configuration
The amount of memory in an IC and how it is accessed.

Memory Controller
The logic chip used to handle the I/O (input/output) of data going to and from memory. See Chipset.

Memory Cycle Time
Minimum amount of time required for a memory to complete a cycle such as read, write, read/write, or read/modify/write.

Memory Mapped IO Reservations
Problem statement:

I just bought a system with 4GB of physical RAM in it. The BIOS posts 4GB, but Windows tells me that I have anywhere from 2.75 - 3.5GB of RAM. Where is the rest of my RAM?

Summary:

If you are running 32-bit Windows, you must live with it. You will not ever see all 4GB of RAM you've paid for. 

If you are running 64-bit Windows, you may have to live with it. Depending on your motherboard's chipset, your system may support memory remapping. If so, you will be able to use all 4GB of RAM.

For more details click here.

Memory Stick
Memory Stick is a removable flash memory card format, launched by Sony in October 1998, and is also used in general to describe the whole family of Memory Sticks. This family includes the Memory Stick PRO, Memory Stick Duo (including the PRO Duo); Memory Stick Micro (M2). In December 2006 Sony added the Memory Stick PRO-HG, a high speed variant of the PRO, to be used for high definition still and video cameras.

Memory Sticks are used as storage media for a portable device, in a form that can easily be removed for access by a personal computer. It is compact, light, reliable and easy to handle. A wide variety of digital content, from photos and computer data to music and moving images, can all be stored on a single stick.

Memory Stick Duo
Memory Stick Duo is a small-form-factor version of the Memory Stick. The Memory Stick Duo is slightly smaller than the competing Secure Digital format and roughly two thirds the length of the standard form factor. It was developed in response to Sony's need for a smaller flash memory card for pocket-sized digital cameras and cell phones.

Memory Stick Micro (M2)
In a joint venture with SanDisk, Sony released this new Memory Stick - Memory Stick Micro (M2). The Memory Stick Micro (M2) measures 15 × 12.5 × 1.2 mm—roughly one-quarter the size of the Duo. Maximum transfer speed is 160 Mbit/s. It comes with an adapter, much like the Duo Sticks, to ensure compatibility with current PRO devices.

The Memory Stick Micro is only 1.2mm thin and has been developed for use in mobile phones. The Memory Stick Micro (M2) cards can be used to store pictures, MP3 files, documents and other content. The media's edges are slotted lengthwise to allow for more slim-line designed connectors to reduce space in host devices. As dual-voltage media, Memory Stick Micro supports devices operating at 3.3 volts and 1.8 volts.

Memory Stick Pro
Memory Stick Pro, a revision of Memory Stick that allows greater maximum storage capacity and faster file transfer speeds. Introduced in 2003 as a joint effort between Sony and SanDisk, would be the longer-lasting solution to the space problem. Memory Stick Pro's have a marginally higher transfer speed and a maximum theoretical capacity of 32GB.

All Memory Stick Pro's larger than 1 GB support this High Speed mode, and High Speed Memory Stick Pro's are backwards-compatible with devices that don't support the High Speed mode.

Certain standard Memory Stick Duo and all Pro sticks are MagicGate compatible.

Memory Stick Pro Duo
Memory Stick Pro Duo from Sony gives maximum storage for compact digital camera, portable audio device, or PSP Handheld Entertainment System. With a large total storage capacity of 512 MB and an increased operating temperature range. With the included adapter, and can be used in most devices that use full sized Memory Stick Pro media, making it perfect for both your older devices and the latest electronics.

Certain standard Memory Stick Duo and all Pro sticks are MagicGate compatible.

Memory Stick Select
A sub-version of original Memory Stick, Memory Stick Select allows two banks of 128 MB to be on the same card. In response to the storge limitations of the original Memory Sticks, Sony introduced the now-uncommon Memory Stick Select, which was similar in concept to the way in which 5.25" floppy disks used both sides of a disk.

A Memory Stick Select was two (or rarely four) separate 128 MB partitions which the user could switch between using a (physical) switch on the card. This solution was fairly unpopular, but did allow for users with older Memory Stick devices to use higher-capacity flash memory.

Memory Types
Cache: static random access memory containing recently used information
DRAM: dynamic random access memory.
SDRAM: single data rate synchronous dynamic random access memory.
DDR SDRAM: double data rate synchronous dynamic random access memory. Usually referred to as DDR.
SLDRAM: synchronous link dynamic random access memory.
RDRAM: Rambus dynamic random access memory.
RAM: random access memory.
ROM: read only memory (permanent memory that cannot be changed).
SRAM: static random access memory.

MHz
See Megahertz

Micron
1. A unit of measure equivalent to one-millionth of a meter; synonymous with micrometer.
2. Also the company name of one of the largest memory producers in the world and the parent company of MemoryTen Technology.

MicroSD Card (TransFlash)
MicroSD, formerly known as TransFlash or T-Flash, was introduced by SD Card Association in the mid of 2005. It is completely compatible with and has the same dimensions as TransFlash memory card. MicroSD has been introduced by the SD Card Association as their new form factor memory card. MicroSD is the world’s smallest memory card and is designed specifically for the new generation mobile phones, which will need large storage capacities for multimedia applications, such as digital music, digital photo, video, videogames, organizers, MMS and email.

The MicroSD is having the same performance regarding transfer speed as the miniSD memory card. The normal transfer speed is 12x or 1.8 MB/sec. High read and write speed enables data to be stored and read more quickly.

MiniSD Card
MiniSD Card is a removable and portable memory device intended for use in cell phones/mobile phones, digital cameras, MP3 players and many other gadgets. The MiniSD card was adopted in 2003 by the SD Association as an ultra-small form factor extension to the SD card standard. While the new cards were designed especially for use in mobile phones, they are usually packaged with a miniSD adapter which enables compatibility with all devices equipped with a standard SD Memory Card slot.

The MiniSD card is made by several different manufacturers and come in different brand names. Their compatibility is universal. The miniSD card is currently produced in capacities ranging from 16 MB to 4 GB.

MIPS
Millions of instructions per second. This measurement is generally used when describing the speed of computer systems.

MLC
A Multi-level Cell, MLC, memory card stores three or more bits in each cell. By storing more bits per cell, a Multi-Level Cell memory card will achieve slower transfer speeds, higher power consumption and lower cell endurance than a Single-Level Cell memory card. The advantage of Multi-Level Cell memory card is the lower manufacturing costs. The MLC flash technology is used mostly in standard memory cards.

The Multi-Bit Cell, MBC, is a similar technology to the Multi-Level Cell but stores only two bits per cell.

MM
A micron (or micrometer). A unit of length equal to one millionth of a meter.

MMC
The MultiMediaCard (MMC) standard was introduced in November of 1997 by SanDisk and Siemens AG/Infeneon Technologies AG.

A MultiMediaCard (MMC) is an IC (Integrated Circuit) which is stored in a compact and rugged plastic enclosure. MultiMediaCard (MMC)s are designed to store data and to enable the transfer of data between devices equipped with MultiMediaCard (MMC) slots.

Current MultiMediaCard (MMC) capacities range up to 2GB. A MultiMediaCard (MMC) is 32mm long, 24mm wide, and 1.4mm thick. The theoretical transfer speed of a MultiMediaCard is 2.5MB/s.

MMCmobile
MMCmobile is a type of memory card based on RS-MMC. MMCmobile memory cards combine the small size of RS-MMC with the high speed of MMCplus. Physically, they appear identical to RS-MMC. They will fit in an RS-MMC slot and are compatible with all RS-MMC devices.

MMCmobile cards come in the reduced-size MMC form factor (18 x 24 x 1.4mm). In addition to the required features of MMCplus cards, MMCmobile cards operate at both 1.65-1.95V and 2.7-3.6V ranges as a requirement. The smaller size and dual operating voltage ranges are ideal for mobile phone and other portable device applications where space saving and extended battery life are essential.

MMCplus
MMCplus is the next generation MMC standard. The MMCplus is following the newer MMC4.1 standard released from the MMCA which allows for a transfer speed more than 20 times faster than standard MMC. These cards are fully backwards compatible with both standard MMC devices and with standard SD devices.

The main difference physically between MMCplus and regular MMC is the number of gold fingers found on the back of the cards. Because of the 8bit data rate of MMCplus, there more gold fingers needed to accomodate the additional throughput.

Motherboard
The main printed circuit board in a computer that carries the system buses. It is equipped with sockets to which all processors, memory modules, plug-in cards, daughterboards, or peripheral devices are connected.

MS
A microsecond: One millionth of a second.

MTBF
Mean time between failures.

MU
Memory unit. Usually a printed circuit board assembly populated with memory chips that stores a certain quantity of memory. Intel term for one of the types of cards in a memory system card set.