Formatting the drive with a Mac format will prevent you from using it with a Windows machine.
The trouble you're having with formatting the drive is common with large size drives. Our drives have their partitioncreated using MBR (Master Boot Record) but most MACS have a limitiationin the size of a MBR partition they can modify. To fix this go intodisk utility and do the following:
Leopard's Disk Utility offers three types of Partition MapSchemes: APM (Apple Partition Map- bootable on PPC Macs), GUIDPartition Table (bootable on Intel Macs) and MBR (Master Boot Record(as it would be formatted from a Windows machine, and often thepartition map that comes on new drives).
You can see what your drive is currently by selecting the drivein the left column of Disk Utility and looking at the info at thebottom of the page. Look at the "Partition Map Scheme:" entry for theanswer.
If that is the case go create a new partition scheme creatingone large partition, and then you should see "Options" which will allowyou to change it from MBR to GUID(most likely) or to APM(less likely). You will want to use GUID. From here proceed normally to format the drive.
Message Edited by Colin137 on 12-09-2008 01:18 PM