Code:
ad0: 8192MB <VMware Virtual IDE Hard Drive 00000001> at ata0-master UDMA33
(Vmware WS6 / Vista / NTFS / ST3320820AS)
/dev/ad0
512 # sectorsize
8589934592 # mediasize in bytes (8.0G)
16777216 # mediasize in sectors
17753 # Cylinders according to firmware.
15 # Heads according to firmware.
63 # Sectors according to firmware.
ad:00000000000000000001 # Disk ident.
I/O command overhead:
time to read 10MB block 0.216514 sec = 0.011 msec/sector
time to read 20480 sectors 2.498505 sec = 0.122 msec/sector
calculated command overhead = 0.111 msec/sector
Seek times:
Full stroke: 250 iter in 1.246622 sec = 4.986 msec
Half stroke: 250 iter in 1.235733 sec = 4.943 msec
Quarter stroke: 500 iter in 1.536449 sec = 3.073 msec
Short forward: 400 iter in 1.681248 sec = 4.203 msec
Short backward: 400 iter in 1.448493 sec = 3.621 msec
Seq outer: 2048 iter in 0.336718 sec = 0.164 msec
Seq inner: 2048 iter in 0.275455 sec = 0.134 msec
Transfer rates:
outside: 102400 kbytes in 1.967604 sec = 52043 kbytes/sec
middle: 102400 kbytes in 0.463944 sec = 220716 kbytes/sec
inside: 102400 kbytes in 0.270255 sec = 378901 kbytes/sec
PHK has said it himself that this is a naive benchmark and the above data confirms it.