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(Or "Mb") megabytes or megabits. When referring to the size or data transfer rate of a storage device which is accessed in multiples of eight bits (e.g. RAM, hard disk) this almost certainly means megabytes, but when referring to the data transfer rate of a communications system it probably means megabits. Some years ago, it is claimed, "MB" always meant megabytes and "Mb" meant megabits but recently this useful distinction has been lost.
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(1) (MB) (MegaByte) One million bytes (1,000,000 bytes or 1,048,576 bytes). See mega and space/time.

(2) (MB) (MotherBoard) On references to basic hardware components, MB often means motherboard or mainboard.

(3) (Mb) (MegaBit) One million bits (1,000,000 bits or 1,048,576 bits). In communications, mega typically refers to 1,000,000. In storage, mega typically refers to 1,048,576. Lower case "b" for bit and "B" for byte are not always followed and often misprinted. Thus, Mb may refer to megabyte. See mega and space/time.

A Whopping Hundred Megabytes!
Back in the 1970s, all 11 of these 14" platters held a total of 100 megabytes. Today, that much platter space would hold more than two million times as much. (Image courtesy of The Computer History Museum, www.computerhistory.org)
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References in periodicals archive ?
At 300bp per sequence, one megabase of DNA would provide more than 3000
maculatus is diploid (2n = 22, n = 11) (Campos, 1972; Merrilees, 1975; Johnson et al., 1981) its C-value is 1.105 pg and is equivalent to 1,082.9 megabase pairs (Mbp).
Each distinct allele of every SSR locus was reamplified with 5' fluorescent labeled primers to obtain accurate allele sizing, and separated on a Megabase 1000 system (Amersham Bioscience, USA).
Examples of research instruments that fit with the clinical/diagnostic area that is GE Technologies larger business are the Codelink microarrays, which have a future as pharmacogenomics tools, and the MegaBASE sequencer for infectious disease testing (see IBO 2/29/04).
The 180- megabase sequence, published in March 2000, was the largest genome yet completed, and this project's success was taken to validate the whole- genome shotgun strategy.
(1) Mb: megabase, equal to 1 million base pairs (2) TIGR: The Institute for Genomic Research (3) Woods Hole: Woods Hole Marine Biological Laboratory (4) UAB: University of Alabama at Birmingham (5) SBRI: Seattle Biomedical Research Institute (6) NMRI: Naval Medical Research Institute (7) SF Gen.
Some colorectal cancers have been found to have upwards of 100 mutations per megabase of DNA; similar findings were reported in some uterine corpus endometrial carcinomas and lung adenocarcinomas and squamous cell carcinomas [49].
La lista de especies se elaboro tomando como base los ejemplares recolectados junto con los registros previos incluidos en la Megabase Mariposa del Museo "Alfonso Herrera" de la Facultad de Ciencias de la UNAM, y una coleccion particular (Coleccion Galindo).
However, some clones, such as TSY216, can gain a replicon of megabase class and maintain it stably.
Analysis of ploidy (in megabase chromosomes) in Trypanosoma brucei after genetic exchange.
Often involving chromosomal fragments ranging in length from one kilobase (one thousand base pairs) to one megabase (one million base pairs), a CNV reflects a segment of DNA that exhibits differences among members of the same species and which may have arisen from nonallelic homologous recombination, an error in DNA replication, or transposable elements.