[root@smart-serv] (/dev/fd) %diskinfo -vt ad4
ad4
        512             # sectorsize
        80026361856     # mediasize in bytes (75G)
        156301488       # mediasize in sectors
        155061          # Cylinders according to firmware.
        16              # Heads according to firmware.
        63              # Sectors according to firmware.

Seek times:
        Full stroke:      250 iter in   5.785304 sec =   23.141 msec
        Half stroke:      250 iter in   4.043090 sec =   16.172 msec
        Quarter stroke:   500 iter in   6.447212 sec =   12.894 msec
        Short forward:    400 iter in   2.396722 sec =    5.992 msec
        Short backward:   400 iter in   3.256960 sec =    8.142 msec
        Seq outer:       2048 iter in   0.455031 sec =    0.222 msec
        Seq inner:       2048 iter in   0.595476 sec =    0.291 msec
Transfer rates:
        outside:       102400 kbytes in   2.485421 sec =    41200 kbytes/sec
        middle:        102400 kbytes in   1.991625 sec =    51415 kbytes/sec
        inside:        102400 kbytes in   3.260551 sec =    31406 kbytes/sec

[root@smart-serv] (/dev/fd) %diskinfo -vt ad0
ad0
        512             # sectorsize
        80060424192     # mediasize in bytes (75G)
        156368016       # mediasize in sectors
        155127          # Cylinders according to firmware.
        16              # Heads according to firmware.
        63              # Sectors according to firmware.

Seek times:
        Full stroke:      250 iter in   7.736239 sec =   30.945 msec
        Half stroke:      250 iter in   7.946960 sec =   31.788 msec
        Quarter stroke:   500 iter in  16.618445 sec =   33.237 msec
        Short forward:    400 iter in  12.306547 sec =   30.766 msec
        Short backward:   400 iter in  12.791753 sec =   31.979 msec
        Seq outer:       2048 iter in   8.237969 sec =    4.022 msec
        Seq inner:       2048 iter in   8.885010 sec =    4.338 msec
Transfer rates:
        outside:       102400 kbytes in  36.944848 sec =     2772 kbytes/sec
        middle:        102400 kbytes in  29.587663 sec =     3461 kbytes/sec
        inside:        102400 kbytes in  19.844300 sec =     5160 kbytes/sec