To taub cov lus tshaj tawm thiab Cov Khoom Siv Hluav Taws Xob (Actual Drive Storage Capacities)
Hauv qee qhov taw qhia, feem ntau cov neeg siv tau los hla ib qho teeb meem uas lub peev xwm ntawm tus tsav los yog disc tsis loj npaum li tshaj tawm. Ntau zaus, qhov no yog qhov tsis tsim nyog rau tus neeg tau txais kev pab. Tsab xov xwm no tshuaj xyuas seb cov tuam txhab muaj peev xwm ntawm cov khoom cia xws li cov tsav nyuaj , cov khoom hauv lub xeev , cov DVDs thiab Blu-ray discs piv rau lawv qhov loj me.
Khoom, Bytes, thiab Prefixes
Tag nrho cov ntaub ntawv hauv computer muab khaws cia rau hauv hom ntawv binary raws li ib qho los yog xoom. Yim ntawm cov khoom ua ke ua tus tshaj plaws uas yog xa mus rau cov khoom hauv kev xam, cov neeg byte. Qhov ntau ntawm cov peev xwm cia tau txhais los ntawm ib qho kev prefix uas sawv cev rau ib qho nqi, zoo ib yam li cov lus ua ntej metric. Vim tias tag nrho cov computers muaj raws li binary lej, cov kab lus ua ntej sawv cev rau 2 qhov nyiaj. Txhua qib yog qhov nce ntawm 2 txog 10 lub hwj chim lossis 1,024. Cov kab lus ua ntej yog raws li nram no:
- Kilobyte (KB) = 1,024 bytes
- Megabyte (MB) = 1,024 kilobytes los yog 1,048,576 bytes
- Gigabyte (GB) = 1,024 megabytes lossis 1,073,741,824 bytes
- Terabyte (TB) = 1,024 gigabytes lossis 1,099,511,627,776 bytes
Qhov no yog cov ntaub ntawv tseem ceeb vim hais tias thaum lub computer khiav hauj lwm los sis qhov kev zov me nyuam qhia tawm qhov chaw nyob ntawm tus tsav, nws yuav qhia txog tag nrho cov kev muaj tag nrho cov bytes los yog siv los ntawm ib qho ntawm cov kab lus. Yog li, ib qho OS uas tau tshaj qhia txog 70.4 GB tau muaj nyob ntawm 75,591,424,409 bytes ntawm chaw cia.
Advertised vs. Tshaj tawm
Vim cov neeg tau txais kev pab tsis xav hais tias nyob hauv kev ua lej 2, cov kws txiav txim siab txiav txim siab los ntsuas feem ntau cov kev tsav tsheb raws li tus qauv 10 tus lej uas peb txhua tus paub txog. Vim li no, ib tug gigabyte sib npaug li ib billion bytes, hos ib qho terabyte sib npaug li ib trillion bytes. Qhov kev lam no tsis yog qhov teeb meem rov qab thaum peb siv cov kilobyte, tiam sis txhua theem ntawm kev nce qib hauv lub prefix kuj nce tag nrho qhov tsis sib xws ntawm qhov chaw tiag piv rau qhov chaw tshaj tawm.
Ntawm no yog ib qho siv ceev los qhia tias tus nqi tseeb txawv qhov txawv ntawm qhov tshaj tawm rau txhua tus nqi tshaj tawm:
- Megabyte qhov txawv = 48,576 bytes
- Gigabyte qhov txawv = 73,741,824 bytes
- Terabyte qhov txawv = 99,511,627,776 bytes
Raws li qhov no, rau txhua lub gigabyte tias cov chaw muag khoom tsav tsheb, nws yog tshaj-qhia qhov nyiaj ntawm qhov chaw disk los ntawm 73,741,824 bytes lossis ze li ntawm 70.3 MB ntawm qhov chaw disk. Yog li, yog hais tias lub khw muag khoom 80 GB (80 npav $ bytes) ib qho nyuaj, qhov tseeb qhov chaw seem yog nyob ze ntawm 74.5 GB chaw, roughly 7 feem pua tsawg dua qhov tshaj tawm.
Qhov no tsis muaj tseeb rau txhua tus drives thiab cia tawm xov xwm hauv kev ua lag luam. Qhov no yog qhov uas cov neeg tau txais kev pab yuav tsum tau xyuam xim. Feem ntau cov tsav nyuaj yog qhia raws li qhov muaj nuj nqis tshaj tawm qhov chaw uas ib lub gigabyte yog ib npuaj ntawm bytes. Ntawm qhov tod tes, feem ntau flash media cia raws li lub cim xeeb nyiaj. Li ntawd, ib daim 512 MB nco daim card muaj raws nraim 512 MB ntawm cov ntaub ntawv muaj peev xwm. Kev lag luam tau hloov ntawm qhov no thiab. Piv txwv li, ib qho SSD yuav teev tau tias yog 256 GB qauv tab sis tsuas muaj 240 GB chaw. SSD cov neeg tsim tawm thaj chaw ntxiv rau cov tuag lub hlwb thiab rau binary thiab decimal sib txawv.
Formatted thiab Unformatted
Hauv kev txiav txim rau txhua hom kev ntaus cia ua haujlwm, yuav tsum muaj qee txoj kev rau lub tshuab computer kom paub cov khoom khaws tseg ntawm nws txheeb rau cov ntaub ntawv meej. Qhov no yog qhov uas qhov formatting ntawm ib tsav tuaj. Cov hom ntawv tsav tsheb sib txawv nyob ntawm lub computer, tiam sis qee qhov feem ntau yog FAT16, FAT32 thiab NTFS. Nyob rau txhua qhov ntawm cov txheej txheem kev teeb tsa, ib feem ntawm qhov chaw cia yog cia kom cov ntaub ntawv ntawm tus tsav tuaj yeem teev cia ua kom lub computer los yog lwm lub cuab yeej siv kom nyeem tau thiab sau cov ntaub ntawv rau tus tsav.
Qhov no txhais tau hais tias thaum ib tus tsav raug teeb tsa, qhov chaw ntim cia ntawm tus tsav yog tsawg dua nws cov peev xwm tsis muaj peev xwm. Tus nqi uas qhov chaw txo yog hloov raws li hom ntawv formatting siv rau tus tsav thiab kuj npaum li cas thiab qhov ntau ntawm cov ntaub ntawv ntau ntawm lawv. Vim nws txawv, nws yuav tsis yooj yim sua kom cov neeg lag luam yuav cim qhov loj ntawm formatted. Qhov teeb meem no feem ntau tshwm sim nrog flash media cia tshaj qhov muaj peev xwm loj zog.
Nyeem cov Specs
Nws yog ib qho tseem ceeb thaum koj yuav lub koos pij tawj, lub zog tsav tsheb los sis lub cim nco kuj tseem ceeb kom paub nyeem cov lus qhia kom zoo. Feem ntau cov tuam ntxhab muaj cov lus qhia hauv lub tshuab ntaus ntawv los qhia tias nws tau txais li cas. Qhov no yuav pab tau tus neeg tau txais kev pab kom paub txiav txim ntau dua.