我的两块硬盘 留底

diskinfo -ctv ad0
ad0
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.

I/O command overhead:
time to read 10MB block 0.153954 sec = 0.008 msec/sector
time to read 20480 sectors 1.951592 sec = 0.095 msec/sector
calculated command overhead = 0.088 msec/sector

Seek times:
Full stroke: 250 iter in 6.229230 sec = 24.917 msec
Half stroke: 250 iter in 4.397800 sec = 17.591 msec
Quarter stroke: 500 iter in 7.038233 sec = 14.076 msec
Short forward: 400 iter in 1.982712 sec = 4.957 msec
Short backward: 400 iter in 1.254739 sec = 3.137 msec
Seq outer: 2048 iter in 0.221814 sec = 0.108 msec
Seq inner: 2048 iter in 0.228228 sec = 0.111 msec
Transfer rates:
outside: 102400 kbytes in 1.359987 sec = 75295 kbytes/sec
middle: 102400 kbytes in 1.652919 sec = 61951 kbytes/sec
inside: 102400 kbytes in 2.796036 sec = 36623 kbytes/sec
diskinfo -ctv ad6
ad6
512 # sectorsize
160041885696 # mediasize in bytes (149G)
312581808 # mediasize in sectors
310101 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.

I/O command overhead:
time to read 10MB block 0.113047 sec = 0.006 msec/sector
time to read 20480 sectors 1.990766 sec = 0.097 msec/sector
calculated command overhead = 0.092 msec/sector

Seek times:
Full stroke: 250 iter in 6.991143 sec = 27.965 msec
Half stroke: 250 iter in 4.926424 sec = 19.706 msec
Quarter stroke: 500 iter in 7.740060 sec = 15.480 msec
Short forward: 400 iter in 2.775153 sec = 6.938 msec
Short backward: 400 iter in 3.088087 sec = 7.720 msec
Seq outer: 2048 iter in 0.216119 sec = 0.106 msec
Seq inner: 2048 iter in 0.233842 sec = 0.114 msec
Transfer rates:
outside: 102400 kbytes in 1.374697 sec = 74489 kbytes/sec
middle: 102400 kbytes in 1.582706 sec = 64699 kbytes/sec
inside: 102400 kbytes in 2.826320 sec = 36231 kbytes/sec