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Date:	Mon, 6 Dec 2004 12:23:33 PST8
From:	"J. R. Fox" <jr_fox@pacbell.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Re: Cause of CD burning failure

Content Type: text/plain

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Thanks, Steve. It seems you are the one responder with pertinent and
useful comment for this query.

Steve Carter wrote:

> Trouble with reading or transferring usually requires retries, which
> slows down the effective transfer rate. A large buffer (cache) is
> helpful or even necessary to overcome this.

And I've maintained this, both for the H/D cache and the memory cache. It
worked fine before, but not now, so it has to be something else.

> Sometimes it may become necessary to make an image of the source disk on
> the HD in order to get a good copy, or to copy at higher speeds.

I suppose you are referring to an ISO image. I never bothered learning how
to do this with RSJ, because I had the dual-drive setup in the full-size
tower, and that worked just fine for me, until now. Since I only have one
drive in the Shuttle -- the burner -- I guess I'll have to learn this
procedure anyway, and maybe start using it for the tower as well.

> Like any high-speed bus, SCSI is very sensitive to cabling and
> termination problems. Re-seating the connectors may help reduce the
> effects of poor contact occurring over time.

This is most likely the culprit. There has been a history of problems with
the devices on that cable with those connectors.

> And a short SCSI bus is a fast SCSI bus. External cables invariably slow
> down the bus. Many SCSI users reserve an entirely separate SCSI bus (at
> least electrically) for the external/slow connection. Dual channel SCSI
> controllers have become popular for this application.

I do have (have always had) one SCSI card (U2W) for the hard drives, plus
one (2940U) for the slow devices. There is an external cable for the
scanner on the latter.

> Just some thoughts.....

Good ones, and much appreciated.

Jordan

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