光驱和 USB 设备不能正常使用，可以检测到但就是不能使用。文件管理里看不到光驱这个硬件。
不是特别懂，不然截个图？
插优盘呢？
这个信息有用没？fdisk -l
光驱已经查出问题，但是 epson L211 打印机驱动程序错误：
D [12/Jun/2013:21:53:16 +0800] cupsdSetBusyState: newbusy=“Dirty files”, busy="Active clients and dirty files"
D [12/Jun/2013:21:53:16 +0800] cupsdReadClient: 12 POST / HTTP/1.1
D [12/Jun/2013:21:53:16 +0800] cupsdSetBusyState: newbusy=“Active clients and dirty files”, busy="Dirty files"
D [12/Jun/2013:21:53:16 +0800] cupsdAuthorize: No authentication data provided.
D [12/Jun/2013:21:53:16 +0800] cupsdReadClient: 12 1.1 Get-Jobs 1
D [12/Jun/2013:21:53:16 +0800] Get-Jobs ipp://localhost/printers/
D [12/Jun/2013:21:53:16 +0800] [Job 16] Loading attributes…
D [12/Jun/2013:21:53:16 +0800] Returning IPP successful-ok for Get-Jobs (ipp://localhost/printers/) from localhost
D [12/Jun/2013:21:53:16 +0800] cupsdSetBusyState: newbusy=“Dirty files”, busy="Active clients and dirty files"
D [12/Jun/2013:21:53:16 +0800] cupsdReadClient: 12 POST / HTTP/1.1
D [12/Jun/2013:21:53:16 +0800] cupsdSetBusyState: newbusy=“Active clients and dirty files”, busy="Dirty files"
D [12/Jun/2013:21:53:16 +0800] cupsdAuthorize: No authentication data provided.
D [12/Jun/2013:21:53:16 +0800] cupsdReadClient: 12 1.1 Get-Jobs 1
D [12/Jun/2013:21:53:16 +0800] Get-Jobs ipp://localhost/printers/
D [12/Jun/2013:21:53:16 +0800] [Job 13] Loading attributes…
D [12/Jun/2013:21:53:16 +0800] [Job 14] Loading attributes…
D [12/Jun/2013:21:53:16 +0800] [Job 15] Loading attributes…
D [12/Jun/2013:21:53:16 +0800] Returning IPP successful-ok for Get-Jobs (ipp://localhost/printers/) from localhost
D [12/Jun/2013:21:53:16 +0800] cupsdSetBusyState: newbusy=“Dirty files”, busy="Active clients and dirty files"
D [12/Jun/2013:21:53:17 +0800] cupsdReadClient: 13 PUT /admin/conf/cupsd.conf HTTP/1.1
D [12/Jun/2013:21:53:17 +0800] cupsdSetBusyState: newbusy=“Active clients and dirty files”, busy=“Dirty files"
D [12/Jun/2013:21:53:17 +0800] cupsdAuthorize: No authentication data provided.
D [12/Jun/2013:21:53:17 +0800] cupsdIsAuthorized: username=”"
D [12/Jun/2013:21:53:17 +0800] cupsdSendHeader: 13 WWW-Authenticate: Basic realm=“CUPS”, trc="y"
D [12/Jun/2013:21:53:17 +0800] cupsdCloseClient: 13
D [12/Jun/2013:21:53:17 +0800] cupsdSetBusyState: newbusy=“Dirty files”, busy="Active clients and dirty files"
D [12/Jun/2013:21:53:17 +0800] cupsdAcceptClient: 13 from localhost (Domain)
D [12/Jun/2013:21:53:17 +0800] cupsdReadClient: 13 PUT /admin/conf/cupsd.conf HTTP/1.1
D [12/Jun/2013:21:53:17 +0800] cupsdSetBusyState: newbusy=“Active clients and dirty files”, busy="Dirty files"
D [12/Jun/2013:21:53:17 +0800] cupsdAuthorize: Authorized as root using PeerCred
D [12/Jun/2013:21:53:17 +0800] cupsdIsAuthorized: username="root"
I [12/Jun/2013:21:53:17 +0800] Installing config file “/etc/cups/cupsd.conf”…
D [12/Jun/2013:21:53:17 +0800] cupsdSetBusyState: newbusy=“Dirty files”, busy="Active clients and dirty files"
D [12/Jun/2013:21:53:17 +0800] cupsdCloseClient: 12
D [12/Jun/2013:21:53:17 +0800] cupsdSetBusyState: newbusy=“Dirty files”, busy="Dirty files"
D [12/Jun/2013:21:53:17 +0800] cupsdCloseClient: 13
D [12/Jun/2013:21:53:17 +0800] cupsdSetBusyState: newbusy=“Dirty files”, busy="Dirty files"
D [12/Jun/2013:21:53:17 +0800] cupsdDeregisterPrinter(p=0x7fc98e7f77c0(epsonl210series), removeit=1)
I [12/Jun/2013:21:53:17 +0800] Generating printcap /etc/printcap…
D [12/Jun/2013:21:53:17 +0800] cupsdSetBusyState: newbusy=“Not busy”, busy="Dirty files"
E [12/Jun/2013:21:53:17 +0800] Browsing=1
E [12/Jun/2013:21:53:17 +0800] BrowseLocalProtocols=0
E [12/Jun/2013:21:53:17 +0800] BrowseRemoteProtocols=1
E [12/Jun/2013:21:53:17 +0800] BROWSE_CUPS=1