Windows 8 and 8.1 Forums

How do I recover an un-allocated partition

  1. #1

    Posts : 1
    Windows 8.1

    How do I recover an un-allocated partition

    I did a clean install from Windows 7 to Windows 8.1 but since the upgrade I seem to have lost a partition on my 3TB HDD
    Under disk manager it shows the partition as un-allocated.

    I have used a recovery tool to recover the data on that partition so that, that partition can be formatted.

    How do I go about doing this as most of the software I've tried does not work

    Click image for larger version


      My System SpecsSystem Spec

  2. #2

    Posts : 2,613
    Windows 3.1 > Windows 10

    at a command prompt (admin) type
    list disk

    Does Diskpart show disk 1 as a GPT disk ?? Because if the disk is MBR there is a 2TB size limit and the disk will need to be converted to GPT in order to use the 3TB
      My System SpecsSystem Spec

  3. #3

    Posts : 879
    Windows 10

    If the disk is MBR there is a 2TB size limit and the disk will need to be converted to GPT in order to use the 3TB.

    Click image for larger version

    Right-click on the disk and select Convert to GPT Disk (see screenshot below).

    Click image for larger version

    Click image for larger version
    Last edited by genet; 31 Oct 2015 at 04:05.
      My System SpecsSystem Spec

  4. #4

    If that disk originally had a single 3 TB partition, it was initialized as "GPT", not the more commonly found MBR. MBR partitions are limited to 2.2 TB. Try to use other partition tools such as Fdisk, EaseUS Partition Master. PS. back up you data in the future in case of similar problem.
      My System SpecsSystem Spec

  5. #5

    if it can't be formatted, there must be physical problem with the drive. after files are well backed up, you can check and repair bad sectors for it. also, it still within warranty, you can seek help from tech-support
      My System SpecsSystem Spec

  6. #6

    Posts : 50
    win8 64bit

    from the screenshot i can tell , your disk is now shown as MBR disk which has a limit of 2 tb. I suggest you first backup your disk in case any thing goes wrong, and convert it to gpt disk with some free software ,such as aomei partition assistant. then you can use the data recovery tools to get your data back.
      My System SpecsSystem Spec

How do I recover an un-allocated partition

Similar Threads
Thread Forum
Partition - Recover Deleted Partitions in Windows
How to Recover Deleted Partitions in Vista, Windows 7, and Windows 8 This tutorial will show you how to recover deleted or lost partitions on your hard disk in Vista, Windows 7, and Windows 8. You must be signed in as an administrator to be able to do the steps in this tutorial. If other...
Will adding a partition upset the Windows partition order?
I would like to add a partition to a drive having the following partitions: Number Partition
Performance & Maintenance
How to disable zero filling of newly allocated files?
Hello! This is an issue for ages. Apparently windows writes zeros by default for all allocated files. Particularly noticable, when downloading with bittorrent, where the app hangs and the hard drive becomes unusable for quite a while. But it's also a problem more generally. Any such allocations...
Performance & Maintenance
BSOD, trying to recover lost partition from external hard
Hi, I'm trying to recover lost partition and files from external USB hard drive (Maxtor Portable 250GB). I'm using disk Internals sofitware and the software finds the files, but when I try to save them on the drive, each time I get a watchdog, or another BOSD error. Here are the dumps....
BSOD Crashes and Debugging
System reserved partition on Disk1. Need partition help
First off, I'm new here so I'm sorry if I am posting this in the wrong section. I appreciate the help. 33378 So that is a screen shot of my disk management screen. As you can see, disk0 and disk1 both have system reserved partitions on them. Disk0 is a SSD that I only want Windows,...
General Support
Moving my Media PC partition using Partition Wizard 7
Suddenly, the Acronis program I used to always use for partition copy, won't detect my USB mouse and KB. So, I'm having to do it with Partition Wizard 7. I've never used that to move a system partition, are there any issues doing it that way? The only other program I used to use for this kind of Op...
General Support
make a logical partition into a primary partition
17344 This is my basic spread prime contains a win 7 installation(active) halo contains a win 8 installation(boot) and is a logical partition What I need to do is: format prime and combine it with halo , this will be my boot and active keep logic and halo as it is an my logical drives I...
General Support

Eight Forums Android App Eight Forums IOS App Follow us on Facebook