Thanks. The reason I formatted it to FAT32 was that I read it must be formatted to this for the Mac install disk to detect it, then I'd re-format it to HFS+ (this is Mac OS Extended, isn't it?) in the setup (a.). The 'Storage' partition is formatted to NTFS, it's simply used for storing movies, music etc.

So I should backup the files then re-format the whole of HDD2 to just one partition using Vista's built-in drive manager (but what format shall I format it to?), install MacOS, THEN make my 'Storage' partition again but using FAT32 so Mac also has write permissions - although I regularly use files around 7gb in size so FAT32 won't work for me. Could I use the NTFS-3G driver to enable Write access for NTFS?