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To: frank brierley <frank_n_brierley@yahoo.com.au>
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From: Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com>
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cc: freebsd questions <freebsd-questions@freebsd.org>
Subject: Re: second cd drive only detected occasonally
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frank brierley <frank_n_brierley@yahoo.com.au> writes:

> I have a DVD drive as secondary slave (IDE) and a cd burner as
> secondary master.  Both drives are detected by BIOS and by windows.
> However freebsd assignes a device to the cd burner (samsung) only
> every now and then.
> 
> Checking dmesg and only acd0 will usually appear.  After a reboot
> there is a fairly good chance that acd1 will appear.
> 
> I've build and installed a current world and kernel cvsup 4.8
> yesterday and changed the IDE ribbon.
> 
> does anyone have any ideas?

I'd be looking for timing problems.  
Maybe try swapping the drives between master and slave?