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Thread: Èçáîð íà USB ôëàø ïàìåò
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31st August 2007 14:56 #1Banned
Join Date: Oct:2001
Location: Ñîôèÿ, Çîíà Á-5
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Èçáîð íà USB ôëàø ïàìåò
Èñêàì äà ñè çàêóïÿ 2 GB USB ôëàø ïàìåò è ìè òðÿáâà ïîìîù çà èçáîðà.
Âúïðîñíàòà ïàìåò ùå ñå èçïîëçâà âìåñòî òâúðä äèñê íà ñúðâúð — ïðèíòåð ñúðâúð. Íÿìà äà èìà ìíîãî çàïèñâàíèÿ, èëè ïîíå ïëàíîâåòå ìè çà ìîìåíòà ñà äà íÿìà. Íà íåÿ ùå ñå ïàçÿò ÷àñò îò èíñòàëèðàíèòå ïðîãðàìè (òàçè ÷àñò ïðàêòè÷åñêè ïî÷òè íÿìà äà áúäå ïðîìåíÿíà) è ùå ñå çàïèñâàò çàäà÷èòå çà ïå÷àò. Àç âêúùè íå ïå÷àòàì ÷åñòî, òàêà ÷å è òîâà ùå å ðÿäêî.
Îñíîâíèòå ìè ïðèîðèòåòè:
1. Äà ãðåå âúçìîæíî íàé-ìàëêî è äà íÿìà ïðîáëåì ñ òîâà, ÷å ùå å äåíîíîùíî âêëþ÷åíà.
2. Âñå ïàê äà èìà âúçìîæíî íàé-ãîëÿì áðîé çàïèñè íà åäíî è ñúùî ìÿñòî, çàùîòî íèêîé íå çíàå êàêâî ùå ìè óäàðè ãëàâàòà, à è äîñåãà íå ñúì íàìåðèë ôàéëîâà ñèñòåìà, ïîääúðæàíà â OpenWRT, êîÿòî äà ìè ãàðàíòèðà çàïèñè íà ðàçëè÷íè ìåñòà.
Õàðäóåðà íà ñúðâúðà èíà÷å å Asus WL-500G Deluxe.
Ðåäàêöèÿ: Åäíî óòî÷íåíèå, îùå íå ñúì ðåøèë äàëè ìè òðÿáâàò òî÷íî 2 GB, ìîæå äà âçåìà è (äîñòà) ïîâå÷å, è ïî-ìàëêî.Last edited by exabyte; 31st August 2007 at 15:10.
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2nd September 2007 08:12 #2
Ïîòúðñè ïðîèçâîäèòåë, êîéòî â õàðàêòåðèñòèêèòå íà ïðîäóêòèòå ñè èçðè÷íî
å ñïîìåíàë çà ïîëçâàíåòî íà wear levelling è/èëè bad block management (BBM).
Îò òóêAnother limitation is that flash memory has a finite number of erase-write cycles (most commercially available flash products are guaranteed to withstand 1000 write-erase-cycles for block 0, and no guarantees for other blocks[citation needed]). This effect is partially offset by some chip firmware or file system drivers by counting the writes and dynamically remapping the blocks in order to spread the write operations between the sectors; this technique is called wear levelling. Another mechanism is to perform write verification and remapping to spare sectors in case of write failure, which is named bad block management (BBM). With these mechanisms in place, some industry analysts[1] have calculated that flash memory can be written to at full speed continuously for 51 years before exceeding its write endurance, even if such writes frequently cause the entire disk to be overwritten. This figure (51 years) involved a worst-case scenario using specific data parameters and should not be confused with a particular "shelf life" for a flash memory device. The bottom line is that a typical user using a commercial device, such as a camera, with a flash drive will probably not wear out the memory for the effective life of the camera.




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