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Date: Fri, 05 Mar 2004 22:41:34 -0800
To: Rishi Chopra <rchopra@cal.berkeley.edu>
From: Chuck McManis <cmcmanis@mcmanis.com>
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cc: freebsd-questions@freebsd.org
Subject: Re: Problems (Still) Mounting CDROM
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As far as your kernel is concerned there is no CDROM drive attached to it.

You should see something like:

atapci0: <Intel ICH4 ATA100 controller> port 
0xf000-0xf00f,0-0x3,0-0x7,0-0x3,0-0x7 irq 0 at device 31.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
... snip ...
sio1: type 16550A
ppc0: parallel port not found.
ad0: DMA limited to UDMA33, non-ATA66 cable or device
ad0: 76319MB <WDC WD800JB-00CRA1> [155061/16/63] at ata0-master UDMA33
acd0: CDROM <ATAPI 44X CDROM> at ata1-master PIO4
... snip ...

Note that the last line identifies the CDROM. Now the most common cause of 
this problem is that the CDROM is set as a "SLAVE" on the ATA bus and there 
is no master on that bus. Or sometimes its set as Master w/Slave Present 
and its waiting for the slave to ack before it does. Either way, its one of 
(in order of likelyness):

         drive is mis-jumpered
         drive is mis-cabled
         drive is dead

HTH
--Chuck