3tb drive only reading 746gb

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wei00007

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Feb 18, 2009
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Hello, first off, please let me say that I know that this topic keeps coming up, and I HAVE searched for the solution before asking this.
But I've updated my BIOS, checked for updated drivers, formatted in GPT and still am having NO luck.

So, bought two 3.0tb WD greens, plug em in, 746gb.
Do research, see BIOS needs updating, update BIOS, BIOS reads drives as 3TB (That's great!)
Windows still refuses to read more than 746gb... Help?

Motherboard is an Asus p6t Deluxe V2, running RAID for two SSD's.
Will provide any other information if you require it, I just need help :(
 
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wei00007

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Feb 18, 2009
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Windows 7 x64
Yes, tried disc manager, the disc only shows as a 746gb, and only will allow that as the max size to format.
Checked in the properties of the drive too, windows reads it as a 746 gig there too.
 
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wei00007

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Feb 18, 2009
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I have two of the drives, one is running from a USB caddy and has the issue, and the other direct SATA to the motherboard, and has the issue.
I am beginning to think that this motherboard just will not read the 3.0tb drives.
 
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wei00007

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Feb 18, 2009
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18,510


I'll try this now.
Thanks!
 
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caseblue

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Dec 27, 2010
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I know this is old [and perhaps solved] but I'm posting my solution on a few of these "New 3TB drive showing as 750GB" threads because I never found this specific [super easy] fix posted anywhere.

Updating the ATA Controller driver via Device Manager was my first idea but it always said "up to date" so I tried many many other things until coming back to the driver. As it turned out, the latest RST driver from Intel [13 something] was not compatible with my ATA controller chipset [Asus P8P67 Pro MB, Win 7 x64, with version 10 Intel RST driver] so it wouldn't self-install/self-update. Intel chat ended up providing a link to a legacy version of RST [12 something] and installing it solved the issue immediately.

The link to the Intel RST Driver that worked for me is provided below. The SetupRST.exe from there is all I used. Good luck.

https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23496&lang=eng
 
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wei00007

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Feb 18, 2009
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Not even close.
I ended up just throwing the drives in an old NAS that I had, they worked in that, but the NAS was god awful, so now I have the drives sitting around doing nothing. I'll copy the data off of the drives, then remove one and try your answer, thanks!
 
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