Ahhh, so the trick is to SELECT the drive, not the volume. But.... shall I create the disk to two partitions then? (Can I do that?.... or it must be the volume?) I am in a confused age of my life. Thanks for your reply. /Hans Bill Fox wrote: > On Mar 21, 2008, at 7:11 AM, Hans M wrote: > >> 4. I booted the MacBook Pro, and started BootCamp Installer. >> The manual was fine, but continuing there is a message I can't >> install Bootcamp on the hardisk. It has to be reformatted in the >> GUID mode, AND WHAT IS THAT? >> >> Anyone knows the trick? >> Whats' GUID formatting, I can't find that option in the >> Disk Manager. >> > > You need to reformat your new drive since Intel-based Macs used the > GUID Partition Map. When you do, you will use all of your data so back > it up. Then, > > Open Disk Utility, select the drive (not the volume), click the > Partition tab, select the number of partitions you want from the pop > down menu, click Options, select the GUID Partition Table and click OK. > > -Bill > > >