AmigaOS device unit commands :
-l devname : tell unit info for all device units
-u devname unit : tell unit info for unit 'unit'
-d devname unit : tell drive info for unit 'unit'
-r devname unit : tell raw drive info for unit 'unit'
-x devname unit mode : put drive 'unit' into transfer mode 'mode'
-p devname unit mode : put drive 'unit' into power mode 'mode' (2: spin up, 3: spin down, 5: sleep forever)
-i devname unit mode : put drive 'unit' into interrupt mode 'mode' (0 : don't use irq's, 1 : use irq's)
-y devname unit : query geometry for devname/unit
-o devname unit : just open & close devname/unit