Video: Vim li cas cov ntaub ntawv digital sawv cev hauv computers hauv binary?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Vim li cas Ua Khoos phis tawj Siv Binary Tus lej? Hloov chaw, computers sawv cev tus lej los ntawm kev siv tus lej qis tshaj plaws siv los ntawm peb, uas yog ob. Qhov no yog qhov binary tus lej system. Khoos phis tawj siv voltages thiab txij li qhov voltages hloov ntau zaus, tsis muaj qhov tshwj xeeb voltage yog teem rau txhua tus lej hauv kaum tsib qhov system.
Ua raws li qhov xav tau, qhov kev piav qhia zoo tshaj plaws yog vim li cas cov ntaub ntawv digital tau sawv cev hauv cov khoos phis tawj los ntawm binary?
Nws yooj yim dua, pheej yig dua, thiab txhim khu kev qha ntau dua los tsim cov tshuab thiab cov khoom siv uas tsuas yog yuav tsum paub qhov txawv ntawm binary xeev.
Tom qab ntawd, lo lus nug yog, dab tsi yog tus sawv cev cov ntaub ntawv digital? Cov ntaub ntawv digital , nyob rau hauv cov ntaub ntawv kev tshawb xav thiab cov ntaub ntawv systems, yog discrete, discontinuous sawv cev ntawm cov ntaub ntawv los yog ua haujlwm. Cov ntaub ntawv digital tuaj yeem sib piv nrog cov cim analog uas coj tus cwj pwm tsis tu ncua, thiab nrog kev ua haujlwm tas li xws li suab, duab, thiab lwm yam kev ntsuas.
Kuj nug, txhua cov ntaub ntawv digital puas tuaj yeem sawv cev hauv binary?
Ntawm ib qho ntawm cov theem qis tshaj ntawm abstraction, tag nrho cov ntaub ntawv digital tuaj yeem ua tau ua sawv cev hauv binary siv cov kev sib txuas ntawm cov lej xoom thiab ib qho xwb. Binary tau siv rau sawv cev ntau complex, ntau dua abstractions, suav nrog tab sis tsis txwv rau cov lej, cim, thiab xim.
Yuav ua li cas yog binary?
Qhov tseem ceeb tshaj plaws MSB ntawm kos npe binary cov lej yog siv los qhia cov cim ntawm cov lej. Li no, nws tseem hu ua kos npe me ntsis. Lub cim zoo yog sawv cev los ntawm qhov muab '0' rau hauv qhov kos npe me ntsis. Ib yam li ntawd, lub cim tsis zoo yog sawv cev los ntawm qhov muab '1' hauv qhov kos npe me ntsis.
Pom zoo:
Vim li cas cov ntaub ntawv tiaj tus tsis zoo dua li cov ntaub ntawv sib raug zoo?
Ib lub rooj ua ntaub ntawv tiaj tus yog qhov tseem ceeb rau kev sau cov ntaub ntawv tsawg. Tab sis cov ntaub ntawv loj loj tuaj yeem ua tsis tau raws li nws siv ntau qhov chaw thiab nco dua li cov ntaub ntawv sib txheeb. Nws kuj yuav tsum tau muab cov ntaub ntawv tshiab ntxiv txhua zaus koj nkag mus rau cov ntaub ntawv tshiab, qhov kev sib raug zoo database tsis
Yuav ua li cas koj sawv cev cov ntaub ntawv nyob rau hauv daim ntawv qhia ncuav qab zib?
Daim ntawv qhia ncuav qab zib yog ib hom kab kos uas lub voj voog muab faib ua ntu uas txhua tus sawv cev rau ib feem ntawm tag nrho. Daim duab ncuav qab zib yog ib txoj hauv kev zoo los npaj cov ntaub ntawv txhawm rau pom qhov loj ntawm cov khoom sib piv rau tag nrho, thiab tshwj xeeb tshaj yog zoo ntawm kev qhia feem pua lossis cov ntaub ntawv sib npaug
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Vim li cas cov ntaub ntawv zoo tseem ceeb heev rau kev sau cov ntaub ntawv txheeb cais?
Cov ntaub ntawv muaj txiaj ntsig zoo yuav ua kom muaj txiaj ntsig ntau dua hauv kev tsav lub tuam txhab kev vam meej vim yog kev vam khom ntawm qhov tseeb-raws li kev txiav txim siab, tsis yog kev coj cwj pwm lossis tib neeg kev xav. Ua kom tiav: Xyuas kom tsis muaj qhov khoob ntawm cov ntaub ntawv los ntawm qhov yuav tsum tau sau thiab qhov twg tau sau tiag
Dab tsi yog cov ntaub ntawv kos npe lossis cov ntaub ntawv headers raws li siv hauv digital forensics?
Hom Cov Ntaub Ntawv Ib daim ntawv kos npe yog ib qho tshwj xeeb ntawm kev txheeb xyuas bytes sau rau hauv cov ntaub ntawv header. Ntawm lub Windows system, cov ntaub ntawv kos npe ib txwm muaj nyob hauv thawj 20 bytes ntawm cov ntaub ntawv. Cov ntaub ntawv sib txawv muaj cov ntaub ntawv sib txawv; Piv txwv li, Windows Bitmap duab file (