3tb Toshiba HDD Showing Up as 746 GB

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Spyderpig

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Feb 28, 2014
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I just bought a new 3tb Toshiba HDD and installed it. In disk management, it is only showing a single 746 partition. I have legacy bios and in it, the full 3tb shows up. I tried finding a solution online but most of them tell me to change to GPT, which I already did, and update the Intel RST drivers. I have an amd processor so updating intels rst is not possible correct?

some more information: i am running windows 7 x64 and the drive is connected via sata, not usb.
 
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tambeshakunt

tambeshakunt

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Jun 5, 2013
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Are you using AHCI or IDE in bios?? Also, are you sure your board supports 3tb drives?
 
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Spyderpig

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I couldnt find out if I'm using ahci or ide... I checked in my bios and also under device manager. And in my bios, i can see that the mobo recognizes the 3tb...

This seems like a common problem but I can't seem to find an answer that helps my situation.
 
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Spyderpig

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Feb 28, 2014
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GPT (I stated in my OP)

And the only unallocated space is the 746 gb but its a 3tb drive and says so in the BIOS.
 
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kenrivers

kenrivers

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Dec 29, 2010
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Sorry, missed the part about GPT in your original post. I'll get back to you if I come up with anything.
To check to see whether or not AHCI go to Device Manager and look for IDE ATA/ATAPI controllers. Click the arrow next to it and tell us what you see.
 
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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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