It's either your hard drive, or the cable for it like KUguardgrl13 mentioned.
disk0 is the Internet Recovery image that gets downloaded from Apple and mounted locally, from which your system boots to facilitate an OS X Install or further troubleshooting. If the system was still able to see your hard drive, then the Internet Recovery image would most likely have been seen as "disk1".
The fact that you were able to start the system in Internet Recovery mode, and you mentioned it was a "mid-2011" suggests to me that your system is possibly an early-2011 model, which shipped with either OS X 10.7 or 10.7.2, (which may have included physical media) which was after Lion was released, but prior to the refresh in October 2011 (which would have made it a late-2011 MBP.) I seem to recall also that shortly after Lion came out, the early-2011 MBP's had an EFI update released for them which enabled Internet Recovery mode on them.
However, only you can confirm the exact model of your system. Easiest way is to turn your system over and reply with the model number listed on the bottom. It should begin with an "A", followed by 4 numbers.
For more information on the specifics of which OS X release came out with which system, go here:
http://support.apple.com/kb/ht1159
Anyways, like I said, it's most likely your hard drive or the cable that attaches it to the logic board.
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