1.    02 Feb 2017 #1
    Join Date : Jun 2016
    West Haven, NSW
    Posts : 8
    Windows 10

    Installation problem, 4TB HDD in W10 Home


    I've just tried to install a brand new 4TB Seagate HDD in an external caddy connected via a USB3 cable to my W10 Home PC. Nothing occurred when I connected it, but I found it in Disk Management. Accessing it in DM required me to initiate the disk and it offered me two choices: one commencing with G (the default), the other commencing with M (I'm sorry, but I don't remember them exactly enough).

    I chose the M option, thinking that I might want to connect to an older version of Windows sometime, but in hindsight I think this is rather unlikely and would like to reverse this - I suppose it's too late now (some low-level format, perhaps?) to change it to the G option.

    What I'm left with is 2 partitions, one of which I can set up as a simple volume and format it. The other partition (~1.6TB) is inaccessible. Right-clicking this partition gives me only Help and Properties. I'd prefer to merge both partitions, but if I've got to live with both, then I'd like also to be able to make it a simple volume too.

    Is this do-able?

    Thanks in advance,
      My ComputerSystem Spec
  2.    02 Feb 2017 #2
    Join Date : Dec 2015
    Posts : 6,013

    You have to be using uefi mode and partition drive as GPT (G) to use all 4TB if you want to install windows on that drive.

    You can convert drive to GPT but would have to reinstall windows

    Is pc uefi capable?

    If drive is just for data, simply convert to gpt using diskpart command.
      My ComputerSystem Spec
  3.    02 Feb 2017 #3
    Join Date : Jul 2015
    Posts : 9,419
    Windows 10 Pro

    It seems like the HDD is just a second HDD for data storage? You will have to wipe the disk to convert it to GPT easily, here's how:

    Change a Master Boot Record Disk into a GUID Partition Table Disk

    As long as you are only using the 4 TB drive as a second drive for data storage, you want it to be GPT. It does not matter if the computer is Legacy BIOS or UEFI.
      My ComputerSystem Spec
  4.    03 Feb 2017 #4
    Join Date : Jun 2016
    West Haven, NSW
    Posts : 8
    Windows 10
    Thread Starter

    Thank you both for your very valuable advice. I've successfully reinstated the ~4TB partition and formatted it. I'm in the process of moving a good number of files to it as I type.

    Yes, the disk is intended as a data storage unit, only.

    Many thanks. I'm marking this thread as solved because of your input.

      My ComputerSystem Spec


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