TDK, I can help you. Last week my power went out while I was playing GT5. Turned back on and got "the hard disk file system is corrupt and will be restored"
If you can get to that message then I can help you. If you can't see that message then I can't.
When you're getting this message it means that something was being written to the hdd when power was cut short. Therefore it corrupts it and makes the drive no longer accessible.
What you need to do to fix this is fairly simple with a little knowledge. The first thing you're going to need is a piece of software. It is from Seagate and called "
Seatools". You will need the DOS version in the downloads section. What this software will allow you to do is test and fix bad sectors within the drive. Bad sectors are what is keeping it from being read. Please read all the info on the site, instructions and all, by clicking the "see tutorial" and "learn more" links. After downloading, you will have to make it into a bootable ISO file. If you don't know what that is or how to make that happen, the link I provided up there has all that info on it, or you can google it. After you have you disk made proceed.
You need to remove your hard drive from the ps3. You then need to connect the ps3 hard drive to the inside of a pc. desktop is easiest. If you need those steps just ask, I'm going to assume you know how to do that.
Now with the drive connected and the disk you made in your PC drive, start up your computer and boot from disk. I'm also going to assume you know how to do that. It will then boot the Seatools user interface. If you read the instructions then you know how to proceed. Make sure the ps3 drive has the checkmark beside it and not your PC's hard drive. PS3 drives that are original Seagate drives will start with "ST". Once checkmarked, run the "long test". It could take as long as 2 hours depending on how large the drive is and how much space is used. My 60gig was half used and took 45 minutes. While it is working you will see the errors being found. Mine had 5. After the test is done you will have the option of fixing the bad sectors found. With a lot of errors there is a chance you lose some data because if "fixes" the sectors by zero filling them, which means deleting the data and filling them with a good, unused sector. Once you select fix the errors it will then run a test and tell you whether or not it passes. My drive after fixing the sectors, passed. Once passed, remove the drive, properly of course(shut down PC, unplug, etc). Put the drive back in the ps3, power on. You will get the error message again, but this time when it does its thing, it will have actually restored this time. It will come up to the select language screen, setup network, and then it will tell you data was found on the drive and the users (listed below) have data that will be restored. All of the users have asterisks beside the name, which is beside the point, and I don't know why. It doesn't matter really. Bam now you are back to "normal". You better make a save of your current game saves immediately. Your drive has bad sectors on it and once that happens it is just a matter of time before it happens again. My drive lasted all of about 6 "on" hours after fixing before corrupting again, and this time it wasn't due to power being cut off. You do need a new hard drive but this method will allow you enough time to get your saves.
My drive corrupted not 5 hours before the 1.05 update was released so you can imagine how I felt. I was at level 26 and the backup feature wasn't even active yet. I scoured the net for hours trying to find a method of recovering my data. Everyone, and I mean everyone said to just wipe the drive, you're just SOL. Don't listen man, I didn't and now I have my data on my other ps3. I lost nothing at all.
If you have any questions at all please reply or feel free to PM me too.
GOOD LUCK