Booted up from live media (ubuntu 12.04) with HDD (3TB, GUID, single EXT4 partition used for storing data and nothing else)connected via SATA. For some reason the file system was only allowing "read only" access so I decided to unmount. I opened up "disk utility" and just clicked "mount" for the heck of it. For whatever reason it hung (and didn't actually end up finishing mount)... So I got impatient and did a sysreq+REISUO thing, but the system never shut off.. Got impatient again and just pulled the plug. Rebooted to find my that there is no longer any partition found on the device.
So basically.. I damaged, corrupted, destroyed, whatever my ext4 filesystem..? obviously all the data is still sitting there..right? I'm prob gonna go ahead and write block + dd the whole thing before before I do anything else, just 'cause.. when I get a hold of a spare 3 TB drive in the near future... that said.. what do I do, if anything, to get my partition and all the data on that partition back? What happened? How do I go about not losing 3 TB worth of data that I hadn't backed up yet?