Looks like they were PATA for version 1 (search for 'PATA'). My guess is that they wanted to keep the SATA ports for their storage, and the motherboard had a P

Looks like they were PATA for version 1 (search for 'PATA'). My guess is that they wanted to keep the SATA ports for their storage, and the motherboard had a PATA port available. It may also have been non-trivial to boot from JFS, which is probably why they wanted a separate disk.