diskinfo -t /dev/ad10
/dev/ad10
        512             # sectorsize
        750156374016    # mediasize in bytes (699G)
        1465149168      # mediasize in sectors
        1453521         # Cylinders according to firmware.
        16              # Heads according to firmware.
        63              # Sectors according to firmware.
        ad:5QK04VAP     # Disk ident.

Seek times:
        Full stroke:      250 iter in   5.018567 sec =   20.074 msec
        Half stroke:      250 iter in   3.635132 sec =   14.541 msec
        Quarter stroke:   500 iter in   5.724386 sec =   11.449 msec
        Short forward:    400 iter in   2.375124 sec =    5.938 msec
        Short backward:   400 iter in   2.729268 sec =    6.823 msec
        Seq outer:       2048 iter in   0.165279 sec =    0.081 msec
        Seq inner:       2048 iter in   0.470965 sec =    0.230 msec
Transfer rates:
        outside:       102400 kbytes in   0.948753 sec =   107931 kbytes/sec
        middle:        102400 kbytes in   1.193829 sec =    85774 kbytes/sec
        inside:        102400 kbytes in   1.988860 sec =    51487 kbytes/sec