I have a Toshiba Satellite laptop running on xp. Recently I bought a 40gb external Maxtor hard disk. The ext Hdd was working good. Me being an idiot did a blunder. I formatted my laptops internal disk. Then i started installing windows xp professional on my machine. In fact the whole installation was completed successfuly. While doing this I was unaware that my ext HDD was connected to my laptop( through an usb port). Actualy I think the operating system was installed on my ext HDD. Any way I had a problem with this ext disk being considered as internal. My operating system says it is a local disk. What should I do in order to repair my external hard disk. As I said before being an idiot I did not back up MBR and Partition tables. Any body please reply..........THANKS.