System get stuck on boot when disk is in CD\DVD-drive
If there is a disk (no matter, CD or DVD, with many files or with one file on it, etc.) in CD\DVD-drive when Linux is booting, system get stuck. Delay in booting continues approximately 15 seconds. In the course of delay LED on CD-drive becomes on for a short while. When a drive is empty system boots without this delay. Here is some information about my hardware:
motherboard: Gigabyte GA-MA770-UD3 (BIOS version: F2);
CD\DVD-drive: NEC DVD-RW ND-3520A (3rd master);
harddrive: Seagate ST380817AS (1st master).
There is an output of dmesg in attachment. What could be a cause of problem?