CONVERT /FS:NTFS on External HDD

Dear users at Kioskea,

I have a ADATA HD710 1TB external HDD and used the "convert f: /fs:ntfs" command on it and it converted from fat32 to ntfs with no problem and I continued coppying files on it on my FRIEND'S laptop. Now when I connect it to MY laptop, it shows the error " You need to format the disk in drive f: before you can use it". As you see, there is a letter assigned to it but in properties, it shows RAW file system.
here is the disk manager screenshot:

http://i62.tinypic.com/2gsmt1c.jpg

1. used chkdsk and everything is fine.
2. used testdisk v7 and there is only one primary bootable partition assigned to it and when I write it to disk, nothing happens:

http://i61.tinypic.com/5ebxvl.jpg

3. I have connected it to ANOTHER PC and everything is fine. the file system is ntfs and my files are accessible. disk manager screenshot:

http://i59.tinypic.com/1fjl1w.jpg

What can I do to fis this problem?

Thank you all