Problems (Still) Mounting CDROM

Rishi Chopra rchopra at
Sat Mar 6 02:06:35 PST 2004

What if the drive is recognized by the BIOS?

Chuck McManis wrote:

> 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
> --Chuck

Rishi Chopra

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