Shoutbox

Use Windows tools instead of PartitionMagic in the first place...

Go to Start > Run, type "compmgmt.msc" and click OK, then go to Disk administration (or something like that - mine is in Spanish).

Yes, you'll lose your data in the disk you want to repartition (unless you're creating a new partition in unused space), but that's the correct way of doing these things.