It is 80GB, 2 x 40GB partitions.
Actually, it consists of 2 x 80GB HDs, 4 x 40GB Partitions, PFS3 on a FastATA4000. All partitions boot happily and they all have over 4GB of info on them (ClassicWB 3.x installed, WHDLoad and just about every game you can think of).
If the HD is connected to motherboard ide/scsi and you coldboot your miggy with the old scsi.device loaded and also modify data above the 4GB you will overwrite the data located in the first 4GB of the HD.
FastATA4000 is different because when you coldboot the card already supports 64bit commands.
