This spins downs some of my external usb drives. I guess this depends on the controller.
No need for a spin-up command, just mount the device and it comes back to life.
The disk utilisation is listed in the last column. This is defined as
Percentage of CPU time during which I/O requests were issued to the device
(band-width utilization for the device). Device saturation
occurs when this value is close to 100%.
Best Answer
You probably want to use "badblocks".