Cluster size update correction.
Automatically uses 64k clusters when formatting > 512GB partitions,
128k clusters when formatting > 1TB partitions, and so forth.
(New system does not allow for users to 'toggle' cluster size via Y button).
Switched display of megabytes to equal 1,048,576 bytes (1024^2).
Extended partitions are now displayed in gigabytes.
Long story short, you can now create partitions greater then 512gb if you want to. Original discussion here. Been tested to work with a small handful of drives now.
Also worth pointing out this thread about using SATA with X-Boxes, as to my understanding the largest IDE drive you'll find is 750gb.