That error indicates that core metadata of the file system in that partition is corrupted.
You can try to FIRST recover important data from it and THEN run chkdsk as described in this KB article...http://support.microsoft.com/kb/176646
Here is Microsoft's warning and instructions from that article...
WARNING: When Chkdsk detects problems with the file system and attempts to repair the damage, data loss can occur. Microsoft does not recommend running Chkdsk with the /f command-line switch unless you have a full backup of your hard disk.
Attempt to repair the damaged file, folder or file system index using Chkdsk. To do so, follow these steps:
Click Start, and then click Run.
In the Open box, type chkdsk /f <drive>:, where <drive> is the letter of the drive on which the damaged file, folder or file system index exists.
NOTE: If the hard disk is large, Chkdsk may take several minutes to several hours to complete.
To attempt to recover data, first I suggest seeing if it can be done in PartedMagic
Boot the computer into PartedMagic.
Click the MOUNT DEVICES
button which is down in the lower left of the desktop. Here's a picture...http://litten.com/images/mount1.jpg
You want to click the green MOUNT
button next to the partition on the bad drive that has the data that you want (there may be more than one partition on it like a factory recovery partition or maybe others)
Click the green MOUNT
button next to the drive partition that you want to copy to. If you aren't sure which drive is which then post a picture or description and we'll try to tell you.
Be patient as they can take a few moments to mount sometimes.NOTE THE NAMES OF THE DRIVE NEXT TO THE UNMOUNT BUTTON
button before you clicked it) They should be something like /media/sda1 and /media/sdb1 (though yours may be different)
Once you have mounted both the bad drive and the drive that we are copying to, you will notice that the File Manager window opened also when you clicked the MOUNT DEVICES
button. In it you will see folders representing your drives. The File Manager window should be displaying the contents of the /media folder and your drives will be folders called sda1 and sdb1 (though yours may have different names that you got by looking next to the UNMOUNT
Double click the folder for your bad drive and if you see your files and folders then simply select what you want to copy to the new drive and right-click and choose COPY
. Then navigate to the folder that represents the new drive and right-click and choose PASTE
just like if you were in Windows Explorer.
Let us know if this works, if you have any questions, if it does not work for you or you can't see the files/drive.
If it does not work, you can try PhotoRec but will not get file or folder names (they will be called a number representing their first LBA) or a commercial product like Restorer Ultimate.