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Date:	Tue, 1 Jan 2002 12:53:43 PST7
From:	sshapiro@ucsd.edu (Sandy Shapiro)
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Re: Your CD Writer under RSJ

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>For CD-ROM drives:

> 1X rate is 150KB/s.
>12X rate is 12 x 150 = 1800KB/s.
>20X rate is 20 x 150 = 3000KB/s.
>
>Even the slowest SCSI PCI HA on earth will easily transfer at that rate.
>The inexpensive HA that you, Peter and I now have will perform
>(10,000KB/s) synchronous transfers and half that asynchronous.
>
>(The last (read) rate (as in 12x10x40 ) is irrelevant to most anything
>you're _likely_ to do. As long as it's over 16-20 it's probably fast
>enough.)

>The penalty is that you'll pay more for the SCSI hardware. If you've
>already got the HA, as we do, then SCSI could be a good choice. Narrow
>SCSI supports 7 devices on a single IRQ. In my IRQ-limited world,
>that's a bargain. It leaves the few IDE ports available for things like
>ZIP drives, an LS-120, a second HD or a cheap CD-ROM reader.

>It is mostly with hard drives that transfer rate begins to really matter.

Dear Steve,

What a terrific answer -- just the kind of information I was looking for.

Thanks,
Sandy

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