Good Ideasseems like you lost the partition info.
You may need to try some "disk recovery", "disk rescue", or "data
recovery" software I tried some free ones and got my data back with one
of them. Can't remember the name...
Can you pop the drive from within the external case and plug it into your PC itself, as a slave? There might be a chance the external case's controller has gone out and the data is fine. I'd want to eliminate the case as being the problem before doing something drastic.
This could be a damaged file system, a failing hard drive, or a failing controller on the external case.
It sounds like you have already removed the drive from the external casing and hooked it up internally.
Then you want to use data recovery software to scan the drive and copy all found data. If PC investigator doesn't work you can try these:
Get Data Back
http://www.runtime.org/gdb.htmOntrack EasyRecovery
http://www.ontrack.com/easyrecoverydatarecovery/You can select all data found by the recovery software and copy everything, but if the hard drive is failing you should decide which data is most important and copy it first. You can usually save your recovery state at each step so you wont have to rescan the whole drive if something goes wrong.
After you have recovered the data, if you intend to use the drive again you should download the diagnostic tool from the hard drive manufacturers website and do a full test.
If it is data you can't afford to lose you should have a professional do this for you.
Bad Ideasconnect it to a windows xp machine and in the command prompt run:
chkdsk <your drive letter>: /f
then run
chkdsk <your drive letter>: /r
if you already tried this then sorry can't help.
only other thing to try is data recovery software
In your situation I would not use scandisk until after using recovery software to backup your data. You can't be sure it is a file system problem, if you run scandisk on a failing hard drive you will make things much worse.
It is possible that you got the hourglass because of a failing controller or hard drive and if Windows was unable to complete communication with the drive it may have marked it as a dirty drive. When you rebooted the PC it is possible that Windows saw the drive marked as dirty which would cause it to run the automatic scandisk during bootup. If this is the case you would have seen the progress of the scan during boot up. If Windows ran this automatic scandisk, it is possible it caused further problems (such as the "This drive is not Formated" message).
If all else fails you can try performing a quick format on the disk which I believe won't destroy all your data just make it "invisible".
Then you can attempt using data recovery software to get the files back.
Worth a shot if you are out of options.
Doing a quick format wont help the situation. If the recovery software is unable to find your data, doing a quick format is not going to help it to find it.