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/$DEV/power/level'. And one has to have CONFIG_USB_SUSPEND=y to do this. On Windows and Mac OS, `safely remove this device' function effectly turns it into `suspend' mode, and it's light off.
You have obviously tested only Windows XP, because Vista doesn't cut the power for at least some USB devices. And congratulations for obtaining a Vista-incompatible hard drive (of course, joking).
BTW, does the "eject /dev/$DEV" command help? -- Alexander E. Patrakov -- 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
