Re: Enable CONFIG_USB_SUSPEND by default or some mobile HD can'tbe unplugged safely

[Mark Lord]

Mark Lord wrote:
> 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.
..

s/SG_IO/SG_IO+SAT/
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