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Date:      Sun, 20 Feb 2000 13:37:57 +0100 (CET)
From:      Soren Schmidt <sos@freebsd.dk>
To:        dmmiller@cvzoom.net (Donn Miller)
Cc:        current@FreeBSD.ORG
Subject:   Re: Question about atapi cdrom behavior (BTC 24X)
Message-ID:  <200002201237.NAA91290@freebsd.dk>
In-Reply-To: <Pine.BSF.4.20.0002200626530.404-100000@lcm208.cvzoom.net> from Donn Miller at "Feb 20, 2000 06:39:25 am"

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It seems Donn Miller wrote:
> Say I do something like
> 
> 	find /cdrom
> 
> is the HD light supposed to be blinking as if the hard drives are being
> accessed?  I did the above command (note that it doesn't involve finding
> files on the hard drives at all), and basically the HD light and the cdrom
> activity light were flashing together.

Depends, some ATAPI devices use the activity LED some dont...

> I have a BTC 24X ATAPI cdrom drive.  I'd like to check to see if anyone
> on this list has one of these, and if so, have you had any problems?  For
> example, if I do
> 
> 	dd if=/dev/racd0c of=cd.img
> 
> the file cd.img is zero-length, dd hangs (ignores ^C totally), and I get
> messages like

That because you miss a bs=2k, a CDROM has a 2k sector size, and depending
on the drives firmware you get different results when you try a blocksize
that is no modulo 2k, your's apparently looses its whits.


-Søren


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