8/14/2019 Data Recovery Glossary - M.pdf
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M DataRecoveryGlossary
MagneticfluxMagnetic
pole
directions
of
the
bits,
their
pattern
is
written
on
the
disk.
ManufacturingYieldThatsegmentofamanufacturingprocessunitproductionthat
issaleableandusable.Itisexpressedasapercentoftotaloutputofthatproduct.
MasterItisasingledriveinitselfbutisthefirstdriveinadualdrivecombination.
MB(Megabyte)Measurementunitequivalentto1024kilobytesor1,048,576bytes.
MediaReferredto
the
coating
material
sometimes.
In
hard
disks,
it
is
the
disks
and
themagneticcoatings.
Megahertz(MHz)Frequencyofmillionsofcyclespersecond.
MechanicalLatenciesContainbothrotationallatencyandseektime.Themain
hindrancetohigherperformancearemechanicallatenciesinharddrives.Time
delaysinmechanicallatenciesareahundredfoldhigherthaninelectroniclatencies,
whichareassociatedwithdatatransferring.SeeSeekTime,RotationalLatency.
MemoryStoragesystem
or
device
that
can
store
and
retrieve
data.
MFM(MultipleFrequencyModulation)Systemthatencodessignalsintobitsor
magneticpulses.
MirroringSystemofcreatingdiscfaulttolerancebystoringinformationredundantly
ondrives.ItsapopulartermforRAID1.
MotherboardFormstheheartofthePCandhandlessystemresources(DMA
channels,IRQlines,I/Olocations)andothercorecomponentssuchassystem
memoryandtheCPU.Italsorecognizesexpansiondevicessuchasmodemsplus
soundandnetworkcards.
MRHeads(MagnetoresistiveHeads)Originallydevelopedtoincreasedrive
performanceandincreasearealdensity.Theyuseseparatereadandwriteelements,
unlikethetraditionalinductivethinfilmreadwriteheads.MRheadswritedataby
usinganinductiveelementandreadinformationbyaseparatemagnetoresistive
element.Thereadelementcandetectrecordeddataonthemagneticdissurfaceas
itcontainsamagneticallysensitivematerial.MRHeadconstructionresultsin
strongersignals
which
permit
it
to
read
higher
areal
density
data,
unlike
the
inductivethinfilmreadwriteheads.Sincereaddataistheonlyfunctionthe
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magnetoresistiveelementcanperform,dataiswrittenontothediskbya
conventionalthinfilm.
MTBF(MeanTimebetweenFailures)Themeantimethatacomponentworks
withoutfailure.Itiscalculatedbydividingthetotalnumberofoperatinghours
observedbythetotalnumberoffailures.Moreover,itisalsotheperiodoftimea
usercanexpectasystemoradevicetoworkbeforeafailureorfaultoccurs.
MTTR(MeanTimetoRepair)Themeantimetakentorepairadrive.Inthefield,
componentlevelrepairsareexcluded,astheyarenotperformedinthefield,and
onlymajorsubassembliesarechanged(sealedhousing,PCBetc.)
MultimediaSimultaneouspresentationbymeansofbothvisualandaudioi.e.
presentationofdatainmorethanoneform.
MultiuserInI.T(informationtechnology),aprocessthatenablesmultipleusersto
accessdataatthesametime.
DolphinDataLabhttp://www.dolphindatalab.com/
