Messages in this thread | | | Date | Fri, 02 Jan 2009 10:50:20 -0500 | From | Mark Lord <> | Subject | Re: Enable CONFIG_USB_SUSPEND by default or some mobile HD can't be unplugged safely |
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Tino Keitel wrote: > On Fri, Jan 02, 2009 at 00:03:43 +0800, Yan Li wrote: >> Hello List, >> >> By default CONFIG_USB_SUSPEND is not enabled and today I got bite by >> this when I got a new WDC My Book hard drive. I have no way to unplug >> it safely, according to it's manual, with a kernel that doesn't have >> CONFIG_USB_SUSPEND=y. >> >> On it's manual read "you should unplug and remove the device only when >> the light is off." On Linux unmounting it won't turn it's light off >> and I can feel it's motor is still running. The only way to unplug it >> properly on a Linux system, as to my knowledge, is to echo `suspend' >> to `/sys/bus/usb/devices/$DEV/power/level'. And one has to have >> CONFIG_USB_SUSPEND=y to do this. > > With a WD My Passport drive (2,5"), I need to use sg_start --stop --pc=3 > to stop the disk before unplugging it. Maybe this works with your > drive, too. This is also required by some Firewire hard disks. Maybe > the eject command should be extended to use this method, as it is used > also by HAL to eject hotplug devices. ..
Incidently, the WD Passport drives support SG_IO, so things like hdparm and smartctl can work with them as well.
Cheers
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