what does this 'cdrom: open failed' message mean

[Harald Hoyer]

Alexander Volovics wrote:
> System Log/Kernel Startup Log contain the message:
> 
> May 10 12:05:15 if kernel: device-mapper: 4.1.0-ioctl (2003-12-10) initialised: dm at uk.sistina.com
> May 10 12:05:15 if kernel: hdb: packet command error: status=0x51 { DriveReady SeekComplete Error }
> May 10 12:05:15 if kernel: hdb: packet command error: error=0x51
> May 10 12:05:15 if kernel: cdrom: open failed.
> 
> However the device seems to be working OK.
> What triggers this message and can I just ignore it.
> 
> Alexander
> 
> 

I think this is lvm scanning all devices for LVM volumes. It tries to 
open /dev/hdb and scan its partition table.