I'd have thought that XP should have given you enough capability to blast the hard disc via USB; you'll probably need to use the "Local Storage Manager" snap in, which is to be found at "Control Panel - Performance and Maintenance - Administrative Tools - Computer Management", which pops up a new window, select "Storage" in the left hard tree then "Disc Management" and you should then be in the right place. Just take great care to ensure you zap the right disk! You want to remove all partitions from the notebook hard disc. If the drive is visible, right-click using the mouse and "Remove Logical Drive" should do the trick.
If that doesnt work, get the Hard disc installed into a PC. You can get notebook -> desktop IDE cables that take the 44 pin interface on your notebook hard drive and turn it into the "conventional" 40 pin + power connector that your ordinary desktop is expecting. The notebook drive will probably want to be the master on the channel you use; I'd probably not have another drive on th same cable to be safe. You could try the XP route again at this point, just in case it now works!
The alternative is to boot up the PC using a DOS floppy disc, then use the DOS "FDISK" command to remove any partitions on the notebook hard drive. If you are doing this I'd disconnect all other hard discs in the PC to remove even the slightest possibility that you might clean out the wrong drive!
Good luck!
And let's be careful out there....
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John Allcock