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I recently upgraded from 10.04 to 12.04, hoping my dvd drive and usb problems will go away. I inserted dvd (some s/w installation) and it would not show up on the desktop. I then did dmesg | grep sr0 and the last several lines of the output are as follows. There is some error which I dont understand and do not know how to fix. Please help.

[ 3914.233310] sr 4:0:0:0: [sr0] Unhandled sense code
[ 3914.233315] sr 4:0:0:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 3914.233321] sr 4:0:0:0: [sr0]  Sense Key : Medium Error [current] 
[ 3914.233328] sr 4:0:0:0: [sr0]  Add. Sense: Unable to recover table-of-contents
[ 3914.233337] sr 4:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 01 00
[ 3914.233354] end_request: I/O error, dev sr0, sector 0
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Please use the code tags (the <$> button in the editor) when pasting commands/logs. It makes it all much more readable. :-) Don't worry, I did it for you this time. – reverendj1 Jul 27 '12 at 19:38
Appreciate it. Will do so going forward. – Kamesh Jul 27 '12 at 19:38
You mention this is a USB drive. Have you tried it on another computer? It seems this is mainly caused by faulty hardware, meaning a bad drive. – reverendj1 Jul 27 '12 at 19:50
No, this is not a usb drive. It is the DVD drive. – Kamesh Jul 27 '12 at 19:53
Sorry, I misread your question. Can you boot to a live CD with it? i.e. the Ubuntu installer? – reverendj1 Jul 27 '12 at 19:55

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