В Tue, 4 Sep 2012 23:55:57 +0400 Anatoly <anat...@kazanfieldhockey.ru> пишет:
> Hello, > I have a problem with my new 32G pendrive: > > da1: <JetFlash Transcend 32GB 8.07> Removable Direct Access SCSI-2 > device da1: 40.000MB/s transfers > da1: 30640MB (62750720 512 byte sectors: 255H 63S/T 3906C) > > I'm using fat32 partition on it. > To make problem occur I can do following things: > 1) write a file about 5MB in size on that partition > 2) unmount > 3) unplug pendrive (so it loses power) > 4) plug it again > 5) mount > Now I can see that the end of file is corrupted. > > Poblem never occurs when I do: > 1) write a file about 5MB in size on that partition > 2) unmount > 3) mount > Also, problem doesn't occur if I'll wait for more than ~10 minutes > before unplugging pendrive. > > So it seems to me that this pendrive has internal write cache in RAM > that needs to be flushed before pendrive loses power. > Problem never occurs with Windows. As I click "remove", windows > somehow "correctly shutdowns" pendrive so it's LED goes off (Unlike > if i just unmount, when the LED stays on) > > What can I do to get cache flushed before unpugging, turn that write > cache off, or any other suggestions? > I've tried camcontrol stop and camcontrol eject with no > success > I using FreeBSD 7.3 with generic kernel here I've found solution: http://lists.freebsd.org/pipermail/freebsd-usb/2008-March/004677.html that 'upower' utility allows to suspend pendrive, and I get cache flushed (And LED goes off): upower /dev/usb0 2 suspend _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
