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mb

(mechanics)
(nuclear physics)

MB

(unit)
(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.

MB

(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 these 14" disks held in total was 100 megabytes. Today, that much platter space would hold 10,000,000 megabytes. (Image courtesy of The Computer History Museum, www.computerhistory.org)
References in periodicals archive ?
base pairs, the number of base pairs in a megabase, by the 300 base
NASDAQ:ILMN) today announced availability of its new TruSeq Custom Enrichment kits which enable researchers to economically design and target genomic regions of interest ranging from 700 kilobases (Kb) to 15 megabases (Mb) of cumulative DNA.
The resulting throughput and reads result in an average cost as low as 45 cents per megabase.
To exploit the full potential of new sequencing techniques, a robust method for isolating biologically relevant genomic loci on the megabase scale will be required.
CNVs are losses or gains of segments of the genome, ranging from a few hundred base pairs to several megabases, which vary in copy number between individuals in a population (1).
First animal genome sequenced (Caenorhabditis elegans: nematode) SIZE: 97 megabases
The advantages of this hybridization approach are that it can be used to capture as much as 100 megabases (Mb) of DNA sequence and that it is highly automatable.
The EML4-ALK fusion gene results from an inversion on the short arm of chromosome 2 (EML4 is located 12 megabases from ALK).
In the majority of classical congenic strains, the donor congenic interval is too large (~50 megabases [Mb] or more) to be easily or thoroughly analyzed with available techniques and to confidently define an individual QTL or gene of interest.
Codon Devices is currently scaling the platform to design and construct engineered genetic devices hundreds of kilobases to megabases in length.
Standard techniques are limited to the detection of aberrations that are 5 megabases or greater.
The MaterniT GENOME test adds genome-wide identification of chromosomal gains or losses greater than 7 megabases (Mb) in size to Sequenom Laboratories' growing NIPT testing portfolio.