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Date: Sat, 19 May 2007 13:25:08 -0400
From: Joe Altman <fj@panix.com>
To: freebsd-questions@freebsd.org
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Subject: Re: acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00
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On Fri, May 18, 2007 at 11:14:50AM +0300, Simon Phoenix wrote:
> 
> I have the same error message since version 1.42.2.3 of the atapi-cam.c.
> Hangs while writing media was fixed in 1.42.2.4, but this error message
> not disappear.
> 
> acd0: DMA limited to UDMA33, controller found non-ATA66 cable
> acd0: DVDR <ASUS DRW-1604P/1.09> at ata1-master UDMA33
> acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00 sks=0x48 0x00
> 0x01

Yes; and from what little I know about this, it is a necessary thing
to have atapicam as a kernel device because USB flash drives require it:

camcontrol devlist
<PLEXTOR CD-R   PX-W1610A 1.04>    at scbus1 target 0 lun 0 (cd0,pass0)
<SanDisk Cruzer Mini 0.3>          at scbus2 target 0 lun 0 (da0,pass1)

Without this:

device       atapicam

there is no use for this:

device  da  # Direct Access (disks)

What I cannot figure out is why only two people are reporting the
existence of this problem.