Proper drive modules for a G5 Xserve?

Hi all,
We need up upgrade the drive modules in a G5 Xserve. I checked in the apple store, and the 750 GB SATA modules have this line:
"These Serial ATA Apple Drive Modules are qualified for use only with the new Intel-based Xserve. For Xserve RAID or older Xserve (G4 based) products, use the Apple Drive Module with Ultra ATA (parallel) support only. For Xserve G5 systems, use the previous generation Serial ATA drive modules."
The problem is, I don't see this "previous generation Serial ATA drive modules" anywhere. Similarly, the Ultra ATA drives have this line:
"These Ultra ATA drives are qualified for use with Xserve RAID only. For Xserve G5 or Intel-based products, use the Apple Drive Module with Serial ATA only. "
My question is, what drive modules should I be using?!
Also, does anyone think Apple will be coming out with 1 TB modules in the near future, and if so, what are the odds of compatibility with the G5 Xserves?

Hey guys,
A heads up.. I've had 4 flavors of SATA ADM:
1. 80GB SATA Hitachi (xserve g5 gen)
2. 80GB SATA Seagate (intel gen)
3. 250GB SATA (xserve g5 gen)
4. 750GB SATA (intel g5 gen)
Needless to say, all 4 work in either the xserve g5 or intel, and either can boot as long as the partioning is setup appropriately (guid or apple). With that said, there actually is a GB size difference between the 2 80GB models, which does make life complicated if you have an only xserve g5 and want to get a new 80GB to make a raid 1 (either the solution is to look for an older model on ebay or to wipe both drives).

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