1TB external HDD no more recognized in XP sp3 or Windows 7 ultimate

[kapadiaab]

Hi,
I have a seagate External desktop drive 1TB which worked fine for a year but suddenly it is not recognized by my PC(XPsp3) or my Laptop (win7 ulti). I have over 800GB of data in it. More than half of it is irreplaceable as it contains family videos and pictures.
I have a free 1TB internal HDD on my PC
Ive searched the internet and tried software like testdisk and minitool power data recovery but both freezes.I dont want to loose my data. Are there any suggestions I can do to salvage my drive?
I have done the basic troubleshooting with seagate and they said they will replace the drive but I will loose the Data. which I cannot!

"PLEASE HELP ME WITH THIS"

[T.J.]

Have you checked properly whether the usb cable provided by the external drive is not cut or having problem, first recheck the cables. After that try to connect the hard drive to some other computer and check whether it is getting recognized or not. This way we can come to a solution whether it is a cable problem or OS problem which is not detecting the hard drive or hard drive problem.

[kapadiaab]

Thankyou for the reply.
Yes I have checked the cable. Ive even tried a different cable from the other drive still no change. The hard drive id detected and comes up RAW in win7 but dosent show up in disk managmt in Xp (It freezes), but does come up in My computer as unpartitioned.