How do I recover an un-allocated partition

nimz

New Member
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1
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

HDD.jpg

Thanks
 

My Computer

System One

  • OS
    Windows 8.1
at a command prompt (admin) type
Diskpart
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 Computer

System One

  • OS
    Windows 3.1 > Windows 10
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Dell XPS 8700
    CPU
    I7
    Memory
    24 GB
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.

Convert to GPT Disk 1.png

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

Convert to GPT Disk 2.png

Convert to GPT Disk 3.png
 
Last edited:

My Computer

System One

  • OS
    Windows 10
    Computer type
    Laptop
    System Manufacturer/Model
    Lenovo G580
    CPU
    Intel Core i5-3230M
    Memory
    8 GB
    Graphics Card(s)
    Intel HD Graphics 4000
    Browser
    Microsoft Edge
    Antivirus
    Windows Defender, standard user account
    Other Info
    UEFI firmware (BIOS) embedded Windows 8 product key.
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 Computer

System One

  • OS
    windows 8.1
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 Computer

System One

  • OS
    win7
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 Computer

System One

  • OS
    win8 64bit
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