Vikas Saurabh wrote: > Flash has limited writes in its lifetime. That is why we have special > filesystems for flash [1],[2] (e.g. jffs2). > > ext3 (due to its journalling) might not be good idea for Sd-card. I > think ext2 would fare fine except that it might be left with corrupted > FS in case improper shutdown but at least it would not impact the life > of the card.
For CF and probably also for SD this is a non-issue. Most, probably all, implement write levelling in the card so special filesystems are not needed. The number of write cycles before failure has increased enormously too. More details here: http://www.storagesearch.com/ssdmyths-endurance.html From a practical perspective we've been using CF cards with ext3 and swap for several years now in server appliances, and they've been more reliable than HDDs in similar situations over that period. Given the restricted bandwidth of the glamo I won't even be able to hit the SD as hard as these are every day, so I have no worries about the lifetime of my SD cards. I will be very surprised if it fails before I decide to upgrade it. > On Mon, Oct 20, 2008 at 6:14 PM, Iain B. Findleton > <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote: > > I did appear to observe that using ext3 on the uSD partitions > appears to be faster than using FAT file systems, however. > > > --VIkas > > [1] > http://en.wikipedia.org/wiki/List_of_flash_file_systems#Flash_memory_.2F_solid_state_media_file_systems > > > [2] http://en.wikipedia.org/wiki/NAND_flash#Flash_file_systems _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community