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<BR>> So basically it seems that given a large enough flash drive with decent <BR>> wear levelling the lifetime should be completely ample...<BR>> <BR>> ...Thats the theory anyway.<BR>> <BR>> I feel quite bullish about the whole thing, but I think I would avoid <BR>> the *really* discounted cheapo flash drives since they may not have the <BR>> correct wear levelling. Decent brand names should be fine though (and <BR>> you can google for details on their specs)<BR>
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Hi<BR>
<BR>
Yeah we contacted a distributor of PQI flash memory. They sent us a wear leveling formula.<BR>
<BR>
Here it is:<BR>
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Example: A 256MB flash device writing 128KB data into flash device the formula as below: ( With wear leveling ).<BR>
DOM Lifetime ( Theory ) = (256MB-100MB)*100K*0.95 / (128KB/sec) *60*60*24= 1340.06 days<BR>
<BR># “0.95” : After the flash being format the capacity might lower than the certain capacity.<BR># “60*60*24” : 86400 writing times per day. 1 time /sec<BR># ”100MB” : The size of your OS & AP. In this case we set it as “100MB”<BR>#“128KB/sec”: The data size that writing onto flash device per second.<BR># ”100K” : The limitation of flash memory’s P/E cycles.<BR>
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P.S. : NAND type flash (Small block) : 1 Block = 32 page * 512byte = 16KB<BR>NAND type flash (Large block): 1 Block = 64 page * 2Kbyte = 128KB<BR>If the data less than 128KB we recommend you still calculate it with 128KB.<BR>
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NOW.. I am truly confused :)<BR>
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<BR>
Juan<BR>
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