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Subject:	Re: SCSI Info
From:	Changhsu P Liu <[log in to unmask]>
Reply To:	PCBUILD - Personal Computer Hardware discussion List <[log in to unmask]>
Date:	Tue, 7 Jul 1998 10:08:30 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (28 lines)

I'm always puzzled by these numbers. How come copying files between my HDs
never seem to exceed 2.5MB/Sec (burst speed)? My SCSI card is rated as
20MB/Sec Maximum, but copying speed seem to be around 1MB average. What
keeps it from reaching the maxium potential speed?

Changhsu Liu

===========
>
>SCSI-2
>  "Fast" SCSI, 50 pins, 10MB/s max.  Usually a standard ribbon
>connector internally and a D-shaped high-density connector
>externally.
>
>SCSI-3
>  Not, the last I'd heard, an official standard, but being used by
>some vendors to refer to "Wide" SCSI, 68 pins, 20MB/s max, using a
>D-shaped high-density connector (but wider than above).
>
>Ultra SCSI
>  SCSI-2, clocked up to 20MB/s.
>
>Ultra Wide SCSI
>  Wide SCSI, clocked up to 40MB/s.
>
>
.....

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