On 04/15/2011 10:29 AM, James Wilkinson wrote: > Joachim Backes wrote: >> I heard that such sticks are only usable if the partitions are formatted >> in fat32; formatting the partitions in ext3 or ext4 makes such >> partitions and the total stick unusable, that means, the partitions >> can't be mounted. > Michael Cronenworth wrote: >> I'm not sure who told you this, but the file system bears no significance. > Mostly right: but many sticks have firmware and hardware performance > limitations when they arenât used with FAT32: > > https://lwn.net/Articles/428584/ says > > In contrast, the more common SD cards and USB flash drives are very > sensitive to specific access patterns and can show very high > latencies for writes unless they are used with the preformatted > FAT32 file layout. > > and > > Ideally, the drive expects all data to be written in full segments, > which is what happens when recording a live video or storing a music > collection on a FAT32 filesystem. > > and > > Additionally, only one segment can be open at a time; alternating > between two segments will cause garbage collection at every access, > slowing write speeds to a mere 33KB/s. That said, the FAT file table > area (from 4MB to 8MB) is managed differently, enabling small writes > to be done efficiently there. > > Hope this helps, > > James. > Yes - I did see considerable read/write delays after formatting a flash that has firmware, with Ext3 filesystem. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
