Windows 7 Won't Recognize 4TB Hard Drive

  1. Posts : 2
    Ultimate x64

    Windows 7 Won't Recognize 4TB Hard Drive

    I had a hard drive which I wanted to reformat. So I back it up and went did a "quick format" on it.

    At that point my 4tb which showed 3.6tb reformated to 1.63tb.

    When I go into disk management Windows which previously saw 3.6 of 4tb only sees 1.63tb.

    So I started over from scratch.

    I deleted the volume, initialized the disk to GPT and but still all it sees is 1.63.

    I have two storage drives on this computer and my other storage drive is recognized as 5.45tb on a 6tb drive, so it's not an issue of Windows not being able to recognize the drives.

    It's not that it's not formatted properly as it is initialized to GPT.

    Out of curiosity I went into Linux with a live usb stick and used GParted. I was able to see the full allocation on the disk and I formatted it in Linux.

    Upon exiting Linux and going back into Windows, NOW Windows shows me the full 3.6 capacity. However other partition managers like Easeus, or MiniToolPartion now report 122% capacity .

    I figured I could just use it since Linux seem to get it formatted correctly, however since it will be used for storage I was a bit nervous and still don't understand why Windows which once allowed it to be formatted correctly won't let t.

    I also checked the drive with the SMARTS tools by Western Digital and they found the drive fine and report 4.0 as the capacity for the drive.

    I thought perhaps a driver issue, but it just then the other drive is fine and so was this one previously.
      My Computer

  2. Posts : 2
    Ultimate x64
    Thread Starter

    I found the answer it was an intel driver located in the


    Zip file I downloaded. I'm not sure which one. I just downloaded the pack, then I went to device manager and under storage controller, I let Windows search the file for the best driver. After it rebooted twice it showed me the entire disc to format.

    It appears the new drivers are:

    jaStorA.sys and jaStorF.sys

    At least those are the things that are different after I did this.

    So if anyone else has a similar problem, don't rule out driver, even if Intel tells you you're up to date.
      My Computer

  3. Posts : 8
    windows 7 64 bit


    Where and what did you update from intel? I have the same problem. And also were you using Linux for this problem? I have windows 7 64 bit.
      My Computer

  4. Posts : 7,061
    Windows 7 Home Premium 32 bit

    Hi EricPost,

    Glad you could resolve the problem. More often than not this problem will get resolved when you use updated IRST drivers. In your case, I have this comment to make.

    "Optional: One of the following F6 Driver Diskettes (depending on your operating system): - For 32-bit versions of the operating system - For 64-bit versions of the operating system"
    F6 and RAID BIOS configurations need to be performed prior to installation of this driver for proper operation. This driver supports NVMe devices.

    I would think you should have rather installed SetupRST.exe

    Download Intel(R) Rapid Storage Technology (Intel(R) RST) RAID Driver
      My Computer

  5. Posts : 7,061
    Windows 7 Home Premium 32 bit

    Hi feihung,

    Make sure your system requires/uses IRST drivers. Check the existing version that is installed. You can download the latest IRST drivers from Downloads for Intel(R) Rapid Storage Technology (Intel(R) RST)-
      My Computer


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