new harddrive 3tb but only shows as 746.24gb when formatted and initialised

I have added a new harddrive to my computer of 3tb,however when i have initialised it it shows as primary partition and only 756.24gb ,so where is the other space?
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More about harddrive 3tb shows 746 24gb formatted initialised
  1. Is the partition in the MBR format, or GPT? If the partition was done in the standard MBR format, it will max out at 2TB; to see all 3TB, it will have to be created in the GPT format. If this is your system drive you'll have to leave it MBR as GPT is unbootable, however. If you need help with knowing where to go to find this information, let me know.
  2. Skeefers said:
    Is the partition in the MBR format, or GPT? If the partition was done in the standard MBR format, it will max out at 2TB; to see all 3TB, it will have to be created in the GPT format. If this is your system drive you'll have to leave it MBR as GPT is unbootable, however. If you need help with knowing where to go to find this information, let me know.


    thanks I shall be trying these to try and sort it out
  3. Ok, let me know if you have any questions and I'll be happy to help.
  4. You don't mention which motherbd you have, not all of them support drives larger that 2.2tb.
    Several motherbfd manufacturers have utilities to enable full size support as do Seagate and Western Digital.
  5. 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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