- end_request errors when detecting CD/DVD ROM devices

I don't know if this is an error or not, but the drives are being 'accessed' as soon as they are detected. Is this correct behaviour?

...
hdc: YAMAHA CRW2100E, ATAPI CD/DVD-ROM drive
hdd: DVD-ROM DDU1621, ATAPI CD/DVD-ROM drive
....
end_request: I/O error, dev hdc, sector 0
hdc: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB Cache, UDMA(25) Uniform CD-ROM driver Revision: 3.12
end_request: I/O error, dev hdc, sector 0
end_request: I/O error, dev hdd, sector 0
hdd: ATAPI 40X DVD-ROM drive, 512kB Cache, UDMA(33) scsi0 : SCSI host adapter emulation for IDE ATAPI devices