Sun/Oracle M5000 Question

I have an M5K with disk issues I'm trying to troubleshoot, and it's causing me some confusion. I know the host has four on-board HDDs, but the format command's output shows c0t0d0, c0t1d0, c3t0d0, and c3t1d0. cfgadm -al shows c0t3d0 as the DVD-ROM drive, and c1 and c2 as SAN disks. Confused yet?

Okay, here's where I am puzzled. Are c0t0, c0t1, c3t0, and c3t1 the on-board HDDs? My supposition is they must be, since c0t3 is the DVD-ROM drive.

Does anyone know for certain? Can someone point me to some documentation that will clarify and define this?

Thanks in advance for all your help.

The output of

iostat -E

allows the system to show the mfg.'s name for each drive. See if that helps. TEAC is probably the vendor for the DVD-ROM. On ours the hdd's are all SEAGATE.

what is the output of:

showboards -a -v
showdcl -a -v
showhardconf -u

from xscf?