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Old 13th November 2008
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ephemera ephemera is offline
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Join Date: Apr 2008
Posts: 537
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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.
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