我的光驱加载后报错,错误信息如下

dragonchina

jh@db10:~$ dmesg | tail
NET: Registered protocol family 10
Disabled Privacy Extensions on device c02cc960(lo)
IPv6 over IPv4 tunneling driver
NET: Registered protocol family 24
ip_tables: (C) 2000-2002 Netfilter core team
apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac)
eth0: no IPv6 routers present
hdb: tray open
end_request: I/O error, dev hdb, sector 64
isofs_fill_super: bread failed, dev=hdb, iso_blknum=16, block

哪位能告知一下是怎么回事.