Mark wrote: > On Tue, Dec 2, 2008 at 9:36 AM, Igor Stoppa <igor.stoppa@xxxxxxxxx> wrote: >> I can only repeat my advice: why don't you do some reading at least >> about jffs2? >> > > Because it's irrelevant in discussions about removable flash memory. How do you know if you did not read it? :-) I wouldn't be surprised if jffs2 technical documentation would discuss NAND pecularities and wear levelling details. Also http://en.wikipedia.org/wiki/Wear_leveling and pdf whitepapers linked on the bottom could explain a lot. > Another issue is that wear levelling depends on there being a certain > amount of free memory in order to shuffle the data around. Most use > dynamic rather than static wear levelling, which reduces the > effectiveness even further when there is little free space. Flash translation layer in memory cards does not know about 'free space', that is filesystem related thing one layer above, we are talking about pure data blocks with no meaning here. That is actually one thing to improve in future, filesystem should let the flash device driver know which blocks are free so it can be more creative with them. Frantisek _______________________________________________ maemo-users mailing list maemo-users@xxxxxxxxx https://lists.maemo.org/mailman/listinfo/maemo-users
