second cd drive only detected occasonally

[Lowell Gilbert]

frank brierley <frank_n_brierley at 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?