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Old 15th November 2008
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Oliver_H Oliver_H is offline
Real Name: Oliver Herold
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Join Date: May 2008
Location: Germany
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da0: <SAMSUNG SP0802N 0000> Fixed Direct Access SCSI-0 device
da0: 40.000MB/s transfers
da0: 76351MB (156368016 512 byte sectors: 255H 63S/T 9733C)

Code:
/dev/da0
	512         	# sectorsize
	80060424192 	# mediasize in bytes (75G)
	156368016   	# mediasize in sectors
	9733        	# Cylinders according to firmware.
	255         	# Heads according to firmware.
	63          	# Sectors according to firmware.

I/O command overhead:
	time to read 10MB block      0.653984 sec	=    0.032 msec/sector
	time to read 20480 sectors  15.376827 sec	=    0.751 msec/sector
	calculated command overhead			=    0.719 msec/sector

Seek times:
	Full stroke:	  250 iter in   5.690934 sec =   22.764 msec
	Half stroke:	  250 iter in   4.177804 sec =   16.711 msec
	Quarter stroke:	  500 iter in   6.369803 sec =   12.740 msec
	Short forward:	  400 iter in   3.462061 sec =    8.655 msec
	Short backward:	  400 iter in   2.018708 sec =    5.047 msec
	Seq outer:	 2048 iter in   1.563425 sec =    0.763 msec
	Seq inner:	 2048 iter in   1.564339 sec =    0.764 msec
Transfer rates:
	outside:       102400 kbytes in   6.454496 sec =    15865 kbytes/sec
	middle:        102400 kbytes in   6.438555 sec =    15904 kbytes/sec
	inside:        102400 kbytes in   6.440142 sec =    15900 kbytes/sec
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