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My /var/log/messages contain lots of messages like this:

Jan 22 05:45:05 vm kernel: hdc: drive_cmd: status=0x41 { DriveReady Error }
Jan 22 05:45:05 vm kernel: hdc: drive_cmd: error=0x04 { AbortedCommand }
Jan 22 05:45:05 vm kernel: ide: failed opcode was: 0xec

I do not even have hdc on my system. What can be the cause of them?

My system is 2.6.18-194.32.1.el5.centos.plus.

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2 Answers 2

up vote 2 down vote accepted

Your drive is likely reacting to being probed by smartd. If so, then there is no real problem. Check smartd.conf and see if the /dev/hdc is mentioned there in a line that's not commented out.

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Well, there is DEVICESCAN -H -m root which probably scans all devices. I have read the thread you linked and I still do not know what the error means. But thanks to you I know what causes it. –  clime Jan 29 '12 at 7:13

It's your IDE based CD-ROM.

Check out what your CD-ROM points to:

ls -l /dev/cdrom

Check what IDE devices you have attached to your computer:

ls -al /dev/hd?

If your machine has freshly or recently booted you can check dmesg:

dmesg | grep -i hdc
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You are right ls -l /dev/cdrom shows /dev/cdrom -> hdc. But could you tell me what the problem actually is with it? –  clime Jan 29 '12 at 6:08
    
For some reason something called or checked your CD-ROM. If there wasn't a disc in the drive then it reported a failure to sense that there was a disk in there. –  smujushi Jan 29 '12 at 19:14

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