Hello! I've got a WD MyBook FW800/USB/eSATA 1TB drive. It was all one partition HFS+/GPT formatted. Since it copies fast I figured I'd like to use it with PCs too as well though, to copy stuff about faster, so thought I might format it MBR instead of GPT, with 2 partitions: a FAT32 and an HFS+ partition. If it's MBR with a large HFS+, and smaller FAT32 partition, do I lose anything by it not being GPT/GUID? Can I use a MBR formatted drive for Time Machine? Any other reasons GPT is preferable (except that it has a backup of the partition table at the end of the drive)? I could do with a bigger TM drive so have considered using it for this, but it seems silly to use the one with a Hi-Speed FW800 connection for that! If I don't use it for TM I could format it all FAT32, but what do I lose from that? It won't search fast with Spotlight then will it?