Txawv RAM nco (Random Access Memory) uas feem ntau siv hauv cov koos pis tawj yog qhov tsis taus. Qhov no txhais tau hais tias thaum koj qhib lub computer, tag nrho cov ntaub ntawv uas muab cia rau hauv lub cim xeeb chips ploj. Hauv qhov sib txawv ntawm qhov no, flash nco yog non-volatile uas txhais tau hais tias cov ntaub ntawv khaws cia ntawm hom kev nco tshuab khaws tseg thaum lub hwj chim raug txiav. Cov ntaub ntawv sau rau thiab tshem tawm ntawm cov cim xeeb chips tshwj xeeb yog ua hluav taws xob tsis yog nyob rau hauv txoj kev kho tshuab - zoo ib yam li cov laus thiab ntau dua EEPROM (Daim Ntawv Cuam Tshuam Tau Txais Kev Nyeem Ntawv). Daim ntawv no ntawm cov khoom siv lub xeev sib txawv ntawm cov neeg kho tshuab xws li cov qauv nyuaj ; cov ntaub ntawv nyob rau hauv cov ntaub ntawv no yog muab siv cov magnetism. Cov hom teeb nyem tseem siv hnub no NTSWV - lub npe no yog tawm hauv lub rooj tshav hlau teeb hluav taws xob NAND tus neeg tsav tsheb vim flash nco siv lub qhov rooj nkag mus hauv MOSFET los ntawm kev sib tsoo.
Nws Ua Haujlwm Li Cas?
Raws li yav tas los piav, flash nco siv floating gate transistors. Cov no yog teem rau hauv ib daim phiaj. Ntau dua li ib hom transistor uas muaj ib lub qhov rooj, flash NAND nco muaj ob lub rooj vag. Muaj ob lub rooj vag ua kom nws 'tau cia' ib qho hluav taws xob ntawm ob lub rooj vag kom nws tsis ntws tawm - qhov no yog ib qho tseem ceeb thiab ua rau txhua yam ntaub ntawv khaws tseg uas tsis muaj dej siab. Qhov tseeb, qhov cuab yeej no (uas yog nruab nrab ntawm cov ntaub ntawv) ntawm tus ntiv tau nyob hauv lub xeev xauv tau ntau xyoo - lossis txog thaum uas koj lwv cov cim xeeb. Cov ntaub ntawv khaws tseg yog tshem tawm los ntawm txhuav cov qhov hluav taws xob deb ntawm nruab nrab ntawm ob lub rooj vag uas yog siv lub qhov rooj tshwj xeeb ntab nruab nrab uas yog tshwj xeeb rau flash tshuab nco.
Ntau Hom Kev Siv Hluav Taws Xob
Muaj ntau tus neeg siv tshuab hluav taws xob uas siv NAND flash nco li cia. Qee cov txheej txheem cia lwm tus siv kuj NAND flash nco. Cov hom kho vajtse uas koj yuav tuaj yeem tuaj thoob plaws uas siv hom kev siv tshuab no:
- MP3 players
- Cov Media Media Players ( PMP )
- Flash phaib / nco sticks xws li MicroSD thiab MicroSDHC
- USB drives
- Smartphones / Cellphones
- Lwm yam khoom siv sib txig sib luag
Qhov zoo thiab kev tsis zoo
Zoo li tag nrho cov cuab yeej siv, muaj kev tsim thiab kev xav ntawm nws. Ib qho zoo tshaj plaws ntawm kev siv flash-based memory (thiab cov cuab yeej siv uas siv nws) yog tias tsis muaj qhov sib xyaw cov khoom uas siv tau los yog yooj yim raug kev puas tsuaj. Rau MP3 players thiab lwm yam khoom siv uas muaj peev xwm ua tau cov suab paj nruag, qhov no yog qhov nruab nrab zoo tshaj plaws uas yog kev tiv thaiv ntawm kev poob siab, kev sib tsoo hluavtaws, thiab lwm yam. Flash nco kuj yog pheej yig thiab tuaj yeem xaiv qhov zoo rau - ntawm cov cuab yeej kho vajtse thiab cov neeg tau txais kev pab uas xav yuav ntxiv kev cia nyob rau hauv daim ntawv ntawm nco cov ntawv cim npe dhau.
Txawm li cas los, flash nco tsis muaj nws cov faults. Rau cov neeg pib, nws muaj kev ua haujlwm thaum kawg ntawm cov sijhawm uas cov ntaub ntawv tuaj yeem sau rau hauv tib cheeb tsam ntawm kev nco. Qhov no yog hu ua P / E cycles (qhov kev pab cuam-yoo cycles) thiab feem ntau muaj ntau kawg ntawm 100,000 nyeem / sau. Tom qab qhov no, lub flash cia yuav ua rau muaj kev cia siab thaum lub NAND nco txog deteriorates. Lub cim xeeb ntawm no nco tau rau MP3 players thiab lwm yam khoom siv txav siv cov firmware uas kis cov nyeem / sau kab tawm ntau tus ciali ua tus ntaus ntawv ntau xyoo nyob rau hauv kev pab li qub. Lwm downside rau nyem nco yog nws tseem tsis ntsuas txog TB (Terabyte) cov kab caws uas peb pom nyob rau hauv mechanical hard drives thiab yog li cov tshuab no siv tsis tau (tsis tau) rau huab tais cia rau hauv lub loj teev.