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刚用光盘安装的 ubuntu 9.10，只是自动更新了一下，装了个vmware 7，光盘还是可以正常使用的
可是之后重启之后光驱就不识别了，不知道是怎么回事？
系统报错：Unable to mount location
mount: special device /dev/scd0 does not exist
ubuntu我还什么都不懂，下面是我从网上看过以后，列举的一些系统信息，不知道对分析有没有帮助，帮我看看吧，
如果还需要什么信息，我随时提供，多谢了!
ls /dev：
adsp lp0 ram9 tty19 tty48 usbmon6
agpgart mapper random tty2 tty49 usbmon7
audio mcelog rfkill tty20 tty5 usbmon8
binder mem rtc tty21 tty50 vcs
block mixer rtc0 tty22 tty51 vcs1
bus net sda tty23 tty52 vcs2
char network_latency sda1 tty24 tty53 vcs3
console network_throughput sda3 tty25 tty54 vcs4
core null sda5 tty26 tty55 vcs5
cpu_dma_latency oldmem sda6 tty27 tty56 vcs6
disk parport0 sequencer tty28 tty57 vcs7
dri pktcdvd sequencer2 tty29 tty58 vcs8
dsp port sg0 tty3 tty59 vcsa
ecryptfs ppp shm tty30 tty6 vcsa1
fb0 psaux snapshot tty31 tty60 vcsa2
fd ptmx snd tty32 tty61 vcsa3
full pts sndstat tty33 tty62 vcsa4
fuse ram0 stderr tty34 tty63 vcsa5
heci ram1 stdin tty35 tty7 vcsa6
hidraw0 ram10 stdout tty36 tty8 vcsa7
hpet ram11 tty tty37 tty9 vcsa8
input ram12 tty0 tty38 ttyS0 vmci
kmsg ram13 tty1 tty39 ttyS1 vmmon
log ram14 tty10 tty4 ttyS2 vmnet0
loop0 ram15 tty11 tty40 ttyS3 vmnet1
loop1 ram2 tty12 tty41 urandom vmnet8
loop2 ram3 tty13 tty42 usbmon0 vsock
loop3 ram4 tty14 tty43 usbmon1 zero
loop4 ram5 tty15 tty44 usbmon2
loop5 ram6 tty16 tty45 usbmon3
loop6 ram7 tty17 tty46 usbmon4
loop7 ram8 tty18 tty47 usbmon5
fstab：
proc /proc proc defaults 0 0
UUID=e2067c05-880f-4caa-a391-f40c082645b5 / ext4 errors=remount-ro 0 1
UUID=f7852587-efe4-4a56-aa6a-ca17f91e239c /home ext4 defaults 0 2
UUID=1AB9-7AF0 /windows vfat utf8,umask=007,gid=46 0 1
UUID=0b6b65db-8533-4488-98d8-eba9d06cb8b9 none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0
ls -al /media：
total 12
drwxr-xr-x 3 root root 4096 2010-02-04 03:17 .
drwxr-xr-x 23 root root 4096 2010-02-04 03:52 ..
lrwxrwxrwx 1 root root 6 2010-02-03 19:36 cdrom -> cdrom0
drwxr-xr-x 2 root root 4096 2010-02-03 19:36 cdrom0
sudo lshw -c disk：
*-disk
description: ATA Disk
product: Hitachi HDP72502
vendor: Hitachi
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/sda
version: GM2O
serial: GEK260RH29UKNA
size: 232GiB (250GB)
configuration: ansiversion=5 signature=00081c5d
lsusb：
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 002: ID 046d:c016 Logitech, Inc. M-UV69a/HP M-UV96 Optical Wheel Mouse
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
sudo mount：
/dev/sda1 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type tmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
/dev/sda3 on /windows type vfat (rw,utf8,umask=007,gid=46)
/dev/sda6 on /home type ext4 (rw)
none on /proc/fs/vmblock/mountPoint type vmblock (rw)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/fouc/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=fouc)
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