3TB Seagate capacity reduced to 750GB after failed Win 7 install


  1. derek2809
    Posts : 12
    Windows 7 Ultimate x64
       New #1

    3TB Seagate capacity reduced to 750GB after failed Win 7 install


    Hello

    I tried installing 64bit Win 7 Ultimate on mirrored 3TB Seagate HDD using a Digitus RAID card and failed. After the failed attempt, I disconnected the HDD and plugged the primary HDD to an on-board SATA connector only to find its capacity reduced to 750 GB. Windows Preinstallation Environment shows the same size and running clean produced no effect.

    Something odd I noticed after running diskpart is that no matter how many drive is connected to onboard SATA, it only shows the 750 GB and the PC name is MINWINPC.

    I`m completely stuck with this and cannot figure any solution. Please anyone help me restore the original 3TB size.

    Looking forward to replies.
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  3. bobafetthotmail
    Posts : 1,711
    Win 7 Pro 64-bit 7601
       New #2

    Could you please have a look at it from disk management and post a screenshot?

    Start - Control Panel - Administrative Tools - Computer Management - Disk Management. (or write "disk management" in the Start searchbox)

    how to post screenshots in this forum
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  4. derek2809
    Posts : 12
    Windows 7 Ultimate x64
    Thread Starter
       New #3

    Thanks for the reply. Disk Management displayed the free space as Unkown Space with the correct capacity, so I zero-filled the hard drives and the drive capacity showed up correctly in the Windows 7 setup menu.

    Regards,

    D
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  6. derek2809
    Posts : 12
    Windows 7 Ultimate x64
    Thread Starter
       New #4

    The free version of Active KillDisk did the job on this occasion.
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  7. bobafetthotmail
    Posts : 1,711
    Win 7 Pro 64-bit 7601
       New #5

    yeah, was suspecting that it did something weird with partitions. Theoretically, any decent third-party partition tool could have done the trick as well without fully erasing the disk.
    Good to know that i's ok now.:)
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  8. derek2809
    Posts : 12
    Windows 7 Ultimate x64
    Thread Starter
       New #6

    Something odd has happened. Because I couldn`t build a RAID array using Intel Rapid Storage Technology after successfully installing Windows on a single HDD, I enabled RAID in the up-to-date BIOS and tried reinstalling Windows 7 on the RAID but failed. So I quick-formatted the HDD and used the MiniTool home edition to repartition it and found one partition with a capacity of about 2.7 TB to install Windows 7 on but the installation stopped just as it was attempting to configure Windows at the last stage.

    I`m not sure if there is an issue with installing Windows 7 on a RAID array. Has someone succeeded in installing Windows 7 on a RAID array using an Intel Desktop Board?
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  10. derek2809
    Posts : 12
    Windows 7 Ultimate x64
    Thread Starter
       New #7

    Myth busted. The trick was to install the Intel Raid Driver F6 upon initiating the Windows install by choosing Driver in Windows Setup. Windows 7 Set Up does not load the driver for the Intel Desktop Board even after you have specified RAID in BIOS and created a RAID array.
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