On Thu, 1 Jan 2009, Alexander E. Patrakov wrote: > 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/$DEV/power/level'. And one has to have > > CONFIG_USB_SUSPEND=y to do this. > > > > On Windows and Mac OS, `safely remove this device' function effectly > > turns it into `suspend' mode, and it's light off. > > You have obviously tested only Windows XP, because Vista doesn't cut the > power for at least some USB devices. Yan never said that Windows cuts any power; he only said that the light turns off. This is accomplished by disabling the USB port, not by cutting power. > And congratulations for obtaining a > Vista-incompatible hard drive (of course, joking). > > BTW, does the "eject /dev/$DEV" command help? I wouldn't expect it to help, since it doesn't disable the port or put the device into suspend mode. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
