https://bugzilla.kernel.org/show_bug.cgi?id=89511 --- Comment #19 from Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> --- Now I see the problem. Your drive doesn't like the SYNCHRONIZE CACHE command; it responds with an error "Illegal request, invalid operation code". It does this even though it claims to have a write cache and therefore to support SYNCHRONIZE CACHE. In short, the bug is in the drive or in its USB interface. You may be able to work around the bug by doing this before you mount it: echo 'temporary write through' >/sys/block/sdb/device/scsi_disk/*/cache_type I don't know if that command will work with your kernel (it should work with 3.10 or later). If it doesn't, try leaving out the word "temporary": echo 'write through' >/sys/block/sdb/device/scsi_disk/*/cache_type -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
