Radio, The info Phoneinx32 say is correct.
I don't know what your problem is. We have been through this before.
Everything Phoenix32 has said about the HW in a 4000 and the 1T has been confirmed. Others have also reported problems with HD's > 250gig.
The OS has a 1T limit, due to the fact that the
XFS file system is 24bit. Just because the HD Supports LBA48bit does not make it a 48bit system.
The weakest link rules here.
Failure to build the raid5 array should tell you something.
You come here for help, then you disregard what we say.
Time for you to move on.
Enough said, case closed.