On 2/28/11 8:52 AM, David Burgess wrote: >> Do you mean re-writing the same file over and over, or just using a CF card >> for a drive? > > Every cell of flash memory is good for a certain number of writes > before that cell becomes effectively read-only. If your fs is > read-write, you don't have much control over where the next write is > going to happen. A wear-levelling flash controller will spread all the > writes around so that the cells age somewhat concurrently, while dumb > flash (most CF cards) have there flash mapped somewhat directly to the > OS's LBA map, and will happily write to the same cells over and over, > greatly reducing the life of said cells, and thus the usable life of > the unit as a whole.
Most cf cards are not and haven't been for a while dumb in that fashion, while it's effort to get manufactuerers to provide docs on the controllers they use (and few use their own) and their implementations are of fairly different and sometime indifferent quality. > Anand explains it better than I: > > http://www.anandtech.com/show/4159/ocz-vertex-3-pro-preview-the-first-sf2500-ssd/2 > > db > _______________________________________________ > Soekris-tech mailing list > [email protected] > http://lists.soekris.com/mailman/listinfo/soekris-tech > _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
