Lub neej expectancy ntawm SD Card yog dab tsi?

SD daim npav yog ib qho khoom siv hauv xeev, txhais tau tias nws tsis muaj qhov txav mus los. Qhov no yog ib qho kev txhim kho loj tshaj cov qub portable cia li zoo li floppy disks, uas muaj nyias, flimsy disks spinning ntawm high speeds. SD daim npav cov khoom yog ib feem ntawm nws cov circuitry, uas yog vim li cas lawv thiaj li me me thiab compact. Cov ntaub ntawv khaws cia rau ntawm flash nco chips uas pom nyob rau hauv circuitry. Flash nco yog hom Electronically Erasable Programmable Read Only Memory (EEPROM) nti. Muaj ob lub ntsiab ntawm lub cim xeeb ntawm tes uas siv hauv cov khoom siv hauv lub xeev xws li SD phaib. Ntau daim npav SD siv ib theem nco cell, uas yog nyob rau lossis tawm. Cov hlwb no tsuas khaws tau ib tus nqi xwb, thiab yog li ntawd yog ceev thiab txhim khu kev qha. Lub downside yog tias koj xav tau ntau ntawm lawv hauv daim npav nco loj. Multi-level cell chips muaj nyob rau hauv feem ntau tus nqi qis SD phaib. Txhua lub cell khaws ib qho hluav taws xob thiab theem ntawm qhov voltage sawv cev rau ntau qhov sib txawv.

Memory cells raug insulated thiaj li tiv thaiv kom tsis txhob raug nqi. Txawm li cas los xij, qhov rwb thaiv tsev no yog eroded txhua zaus ua haujlwm sau ntawv. Sij hawm dhau mus, qhov no tuaj yeem ua rau qhov hluav taws xob hauv lub xov tooj hloov pauv me ntsis, uas tuaj yeem ua rau cov ntaub ntawv ntawm SD daim npav puas. Cov npav SD niaj hnub no feem ntau yog tsim los txhawm rau txheeb xyuas cov teeb meem ntawm lub hlwb thiab zam lawv, tab sis dhau sijhawm, yog tias muaj ntau dhau lawm, daim npav yuav tsis muaj lub cim xeeb txaus los qhia lawv. Lub neej ntev ntawm daim npav SD nyob ntawm ntau yam. Piv txwv tias nws tsis ua rau lub cev ua ntej, yog tias koj siv koj daim npav feem ntau - piv txwv li ntau tshaj ib zaug hauv ib lub lis piam - nws yog ib lub tswv yim zoo los hloov nws ib xyoos ib zaug. Pinpointing raws nraim thaum koj hloov koj daim npav SD yog tias nyuaj vim muaj kev sib txawv ntau tus neeg muab tso rau hauv. Muaj feem yuav yog tias koj daim npav SD yuav tsis ua haujlwm vim kev puas tsuaj ua ntej nws pib ua rau koj cov ntaub ntawv tsis raug. SD phaib yog tsim los nrog cov khoom pheej yig kom txo cov nqi, thiab yog li ntawd, nws yooj yim heev rau kev tawg.

Ib yam uas SD phaib yeej tsis tsim nyog rau lub sijhawm ntev, vim tias tus nqi hauv cov hlwb xau dhau sijhawm. Txawm hais tias muaj daim npav SD tshwj xeeb uas tau tsim los tsuas yog sau rau ib zaug, thiab siv rau lub hom phiaj khaws cia, cov ntawv luam tawm SD zoo li qhov koj xav siv hauv lub koob yees duab yuav tsum tsis txhob siv zoo li no. Feem ntau daim npav SD yuav tsis khaws cov ntaub ntawv rau ntau tshaj li tsib xyoos. Qhov kev coj ua zoo tshaj plaws rau kev ua kom koj cov ntaub ntawv muaj kev nyab xeeb yog luam tawm ntawm koj daim npav SD rau koj lub computer sai li sai tau.