3TB drive only shows as 746.52GB in Windows XP.

I just purchased a 3TB Descktop Drive (DT01ACA300) because on the box it says it works with Window XP. However, when I installed the drive as a Data Drive (not the boot drive), booted the system & looked in the drive manager, it shows that the 3TB drive is only 746.52GB.
When I go into my BIOS the drive shows up as 3000GB (3TB), so the BIOS sees it correclty. Other Hard Drive manufactureres supply software with their drives so that they work correctly with Windows XP. I assumed that would be the case when I bought this drive.
Does anyone know what I need to do to get this drive to work correctly in Windows XP or how I get support from Toshiba???

Windows XP does not support either large drives or those with advanced-format technology. See KB2581408 and KB2510009. Your drive is both.
This Paragon utility should overcome the problem when it's a data drive.
   HGST GPT Disk Manager
-Jerry

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