I followed this procedure for spinning down usb disk when not used. http://tomatousb.org/tut:spin-down-usb-disks-when-not-used I'm using an Asus RT-N16 and the external drive's 2 usb cables are plugged in. I've just got Optware installed recently. scsi-stop /dev/sda works all the time. When I run lsusb it doesn't show any more detail than the following: Bus 001 Device 002: ID 152d:2329 Bus 001 Device 001: ID 1d6b:0002 Is there a step I missed or something else? Thanks.