maybe because I have not thought about it before? Is there a problem here? anyway my initial question was about the maximum capacity HD of the 6100, not about formating.
In anycase the 6100 may not have regonize the drive anyway since it could not boot from a partition larger than 2 gb anyway.

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To answer your question, the SCSI bus in a PowerMac 6100 will work with drives up to 2 terabytes. You can get a 2 terabyte SATA drive, connect it to a SATA-IDE adapter, then to your IDE-SCSI adapter and see the entire drive. I have a similar setup in my Amiga 4000.

With regards to how you'd format it, you could use FWB or other programs, but later versions of Drive Setup should be able to be used regardless of the make of the drive. However, I'd recommend 8.1 or higher (you can run up to 9.1, at least) so you can use HFS+ partitions.