Hi all, this is my first post and i'm new to data/hdd drive recovery field so if my post seems a little amateur please forgive me

. I'm trying to recover a disk with the very valuable data on it (no way i can format the disk). The original problem is - Windows XP user was unable to reach external hdd drive(Samsung G2 Portable 640GB USB) - on initial hdd plugin to the PC, indicator lighted up for a 15 seconds and then gone black(turned off). Assumed that there might be a problem with the drivers, and tried another PC(Windows 7 in this case) things looked differently now. The drive
did not turn off and indicator was on, though, i was unable see any attached devices in My Computer section. This excluded the hardware failure which was great

Tried to check the status of the drive using windows
chkdsk - with the following error -

- Error on chkdsk Windows 7 disk analysis
- ErrorOnChkdsk2012-03-27.jpg (20.6 KiB) Viewed 6166 times
. Finally after 15 minutes or so (Windows 7) detected a drive but trowed another error -

- Error on Access Windows 7 disk access from My Documents
- ErrorOnAccess2012-03-27.jpg (27.98 KiB) Viewed 6166 times
searched for a solution and found your fabulous and free tool (great work!)
Though i'm not sure what should i do in this situation not to loose the data, tried Analyse>Quick Search>Wirite option with no luck. Could someone guide me through the recovery process (I assume MBR recovery is necessary in this case)? Here is a screenshot of the testdisk 6.11 in Ubuntu

- Screen of testdisk 6.11 Intel> Analyse section
- ScreenOfAnalyse2012-03-27.png (53.86 KiB) Viewed 6166 times
and one more thing to mention - by the great surprise i can
see all the data on failed hdd using Ubuntu OS with no problem,
can access it and
read from the drive with no problems at all, by many precautions understand that i'm prohibited to write anything to the drive. Could someone with expertise knowledge in using this software guide me through the recovery process? Thank you
