On Mon, 19 Jan 2004, Cordula's Web wrote: > Beware when using flash ram as some kind of live filesystem! > Flash media has a quite limited number of erase cycles > You may think that's plenty, but since filesystem meta-data > is often written at the same location (superblocks etc...), > this location will quickly reach the threshold, where it > can't be used anymore!
Current flash memory spreads the writes around through "wear leveling." A logical write to an address is remapped internally to keep the wear as even as possible. There's a kind of neat calculator at: http://www.m-sys.com/content/Developer/Calc.asp There's also a PDF from the same company that talks about how it works, but I couldn't find it on their web site, so: http://www.spezial.de/commercio/dateien/magazin/FFD_Life_Expectancy.pdf -Warren Block * Rapid City, South Dakota USA _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"