[blue68f100]

Did some more digging. It looks that only the 4500 is listed with storage above 1T (1.6T). Most all other stop at 720gig. I then went back through my records where I worked with a user tring to upgrade a 4400. What was discovered was the drives would reconize large disk but disk format was limitted, prior till building the raid.

Here are some details to get you thinking. OS v 2.6 BIOS ????.

Org 160gig Maxtors 4G160J8 formated to 154,476 gig (RAID5) cap.
200gig WD2000JB-00 formated to 169,7700 gig (RAID5) cap.
200gig Maxtor 6L200P0 formated to 154,476 gig (RAID5) cap.
The 160 gig maxtor had as much usable space as the 200gig Maxtor
All of the 4 disk array raid5 sets were roughly the capacty of 3 x formated space
With the 200gig maxtor giving away 45gig to the 160 gig.

So it apears there is some issues with Large drives on Guardian OS units, too. All execpt 1 (4500) will accept 400gig drives.

Sam, I confirmed what you found on the kernel.