In the end I loaded on Vista and then researched the problem after I got everything up and running. Once installed, Vista’s disk management tool could now see the partition (listing it as an EISA partition) but wouldn’t let me do anything with it (i.e. I couldn’t delete it). Then I found a post on thinkpads.com here: http://forum.thinkpads.com/viewtopic.php?t=39651&highlight=eisa+partition which solved my problem. In that post the bloke basically reformatted and installed Vista on top, but I already had it installed so I deleted the hidden partition then used the disk management tool in Vista to extend my existing partition. I guess you just have to make sure you delete the correct partition when you do this so be careful! Here’s the commands I used:
From a command prompt, type DISKPART – a new window should open.
DISKPART> list partition
Partition ### Type Size Offset
————- —————- ——- ——-
Partition 1 Primary 89 GB 1024 KB
Partition 2 OEM 4622 MB 89 GB
DISKPART> select partition=2
Partition 2 is now the selected partition.
DISKPART> delete partition override
DiskPart successfully deleted the selected partition.