Maybe you could try this:

- Copy the content of the first 250GB disk to the 750Gb disk.
- let the asus boot with the 750 Gb disk
- remove volume1 with the webgui
- make a new volume with the webgui
- take it out
- copy the files of the 250GB disk (volume1) to the 750GB disk (volume1)

you also might try to copy only the hidden information to the 750 Gb disk (to make it bootable, try to boot it with Asus, and define a new VoluME1, etc.

But I don't have any experience with a brand new disk. It seems to me that several people other people have... But where are they?

Marc