Unable to access cdrom

[SnapJack]

Hi.
Well i am a newbie to linux.I managed to install red hat linux 7.1.Initally i had problems with this but then managed to install with the no DMA option.
Now the problem comes up wen i try to access my cdrom.
My machine hangs and i am forced to restart my machine.
I refered to the excore website and this what i got to know
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Q. Whew, I disabled DMA with "ide=nodma" and the install completed! But now I seem to be having problems while running normally? Is this also DMA related?
A. Most probably yes as the "ide=nodma" option does not disable DMA permanently - it only disables DMA for the current session.
Q. So how do I disable DMA permanently?
A. Depending on how the CDROM drive has been physically connected to your system, add one of these lines to /etc/rc.d/rc.sysinit:
/sbin/hdparm -d0 /dev/hdb # Add this if your CDROM is on primary slave
/sbin/hdparm -d0 /dev/hdc # Add this is your CDROM is on secondary master
/sbin/hdparm -d0 /dev/hdd # Add this if your CDROM is on secondary slave

If you are unsure about the CDROM device id, the "dmesg" output will have it:
~# dmesg|grep CD
hdc: ATAPI 48X CDROM, ATAPI CD/DVD-ROM drive
hdc: ATAPI 48X CD-ROM drive, 128kB Cache,
UDMA(33) Uniform CD-ROM driver Revision: 3.12

In this case, CDROM drive is /dev/hdc.
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well i did try the above option but all in vain.
i continued to have the same problem..
Please help me out..

 

[ifincham]

Hi,

What do you get on your system from the command :

cat /var/log/dmesg | grep CD

and

cat /proc/ide/hdb/settings

(assuming its /dev/hdb - change if different)

Regards