# diskinfo -t /dev/amrd0
/dev/amrd0
        512             # sectorsize
        110849163264    # mediasize in bytes (103G)
        216502272       # mediasize in sectors
        13476           # Cylinders according to firmware.
        255             # Heads according to firmware.
        63              # Sectors according to firmware.

Seek times:
        Full stroke:      250 iter in   1.614163 sec =    6.457 msec
        Half stroke:      250 iter in   3.750013 sec =   15.000 msec
        Quarter stroke:   500 iter in   4.191080 sec =    8.382 msec
        Short forward:    400 iter in   1.083575 sec =    2.709 msec
        Short backward:   400 iter in   3.375540 sec =    8.439 msec
        Seq outer:       2048 iter in   0.892792 sec =    0.436 msec
        Seq inner:       2048 iter in   0.938676 sec =    0.458 msec
Transfer rates:
        outside:       102400 kbytes in   6.334387 sec =    16166 kbytes/sec
        middle:        102400 kbytes in   6.364501 sec =    16089 kbytes/sec
        inside:        102400 kbytes in   6.312508 sec =    16222 kbytes/sec