3Tb Caviar showing up as 745Gb

I’m using Widnows 7, 64 bit. BIOS Raid page shows only 745Gb. OS RAID Mgr show it as 2745Tb. Windows Disc Manager shows only 745Gb in a simple volume. This drive is intalled internally and is to replace a failed drive in a RAID 1 array.

Anybody solved this problem?

This is a MOBO limitation

try downloading drivers and upgrading the Bios