Server 2003 4TB Drive showing as 1.6TB after GPT conversion

I installed a 4TB hard drive onto a server running server 2003 small business server.  I see the drive in disk management as 1.6TB only.  Converted the drive to GPT and still only see it as 1.6TB.  I have done this before on the same server with an external USB drive and it shows up as 4TB with no problems.  Any suggestions/help?
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
bring up diskpart from the command prompt

DISKPART> list disk
DISKPART> select disk (id)
DISKPART> online disk (if the disk is not online)
DISKPART> attributes disk clear readonly
DISKPART> convert gpt
DISKPART> create partition primary
DISKPART> select part 1
DISKPART> active (if this is the boot partition)
DISKPART> format fs=ntfs label=(name) quick
DISKPART> assign letter (letter)
DISKPART> list volume
dboneheadAuthor Commented:
Thanks for the comment above.  I did all of that.  Still only shows the 1.6TB.  I'm beginning to think it may be a limitation of the motherboard.
David Johnson, CD, MVPOwnerCommented:
sounds like it.  What does the bios say for the size?  It could be a bad drive?  What happens if you put the drive in the usb enclosure?
dboneheadAuthor Commented:
I actually had two drives that were 4TB.  One kept having problems where the BIOS wouldn't recognize it at all.  I tested it using the same cable and plugged into the same SATA connection as the one that is working and the drive that is good shows up in the BIOS.  It only shows 1.6TB.  I'm going to award you the points for responding.  I spoke to the owner and talked them into purchasing a DROBO NAS.
David Johnson, CD, MVPOwnerCommented:
I like Drobo's
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