为什么启动检测刻录机时出错？？

Freebird

开机检测刻录机的时候会长时间挂起。下面时dmesg看到的:

2. acd0: CDROM <ATAPI-CD ROM-DRIVE-50MAX> at ata1-master PIO4
3. acd1: CD-RW <SAMSUNG CDRW/DVD SM-348B> at ata1-slave PIO4
4. cd0 at ata1 bus 0 target 0 lun 0
5. cd0: <ATAPI-CD ROM-DRIVE-50MAX 50FA> Removable CD-ROM SCSI-0 device
6. cd0: 16.000MB/s transfers
7. cd0: Attempt to query device size failed: NOT READY, Medium not present
8. Mounting root from ufs:/dev/ad0s1a
9. cd1 at ata1 bus 0 target 1 lun 0
10. cd1: <SAMSUNG CDRW/DVD SM-348B T500> Removable CD-ROM SCSI-0 device
11. cd1: 16.000MB/s transfers
12. cd1: Attempt to query device size failed: NOT READY, Medium not present - tray closed

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