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Old 03-07-2013, 04:07 PM   #1
waddles
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TBW for flash drive


I am looking to find the TBW for a couple of flash drives.
Is there a list that contains that information?
 
Old 03-11-2013, 09:11 AM   #2
TB0ne
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Quote:
Originally Posted by waddles View Post
I am looking to find the TBW for a couple of flash drives.
Is there a list that contains that information?
No. You can look up drive specs on the various manufacturers websites, and compare them. If you want to do it yourself:
For MTBF:
Code:
( {Total bytes} * {program erase cycles of that flash} ) / ( {speed of writes to drive in seconds} * {duty cycle of drive or % of time its operating} * {% of writes vs reads when drive is on} * {Write Amplification} ) = Operational life of drive in seconds (or MTBF)
For TBW:
Code:
(P/E cycles) * (total bytes) = TBW
And this doesn't take into account if it's MLC or SLC flash, which vary a LOT in price and MTBF/TBW. And write amplification is a factor in TBW, but just to get a ballpark TBW, you can ignore it.
 
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Old 03-11-2013, 10:37 AM   #3
waddles
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Where U use TBW are U meaning "total bytes writeable" or "total bytes written" ?
Is "P cycles" Writes processed and I don't recognize "E cycles" if U would define please?
 
Old 03-11-2013, 10:49 AM   #4
TB0ne
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Quote:
Originally Posted by waddles View Post
Where U use TBW are U meaning "total bytes writeable" or "total bytes written" ?
Is "P cycles" Writes processed and I don't recognize "E cycles" if U would define please?
Spell out your words.

And TBW has only one meaning in this context, and that's total bytes writeable. The P/E cycles is defined in the first equation clearly, as "program erase cycles".
 
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