HDD Unallocated Space Data Recovery [2 Ways]

Don't make any changes to your hard drive when it becomes unallocated. Here, EaseUS software will guide you perform HDD unallocated space data recovery, getting lost partitions back in two reliable and secure ways.

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Table of Contents

How to Perform HDD Unallocated Space Data Recovery

"About 2 hours ago, I connected my 2TB western digital external hard drive to my computer, but the drive wasn't showing up on my computer. I checked it in disk management, the disk became unallocated.

I unplugged and re-plugged the HDD to my computer via USB ports, but it still didn't show up in the File Explorer. What can I do to perform HDD unallocated space recovery and rescue my data?"

If you are having a similar problem on your HDD, figure out the reasons first. Here are the main causes of why HDD turns to unallocated:

  • Partitions get deleted or removed by mistake
  • File system damage, corruption or errors
  • Hard drive failure with bad sectors or internal errors
  • Virus attack

If your hard drive was infected by an unknown virus, clean up the virus first by using anti-virus software first.

To fix the unallocated issue, you need to figure out which is more important to you - the data or the partition on the drive. To rescue valuable data immediately, follow Way 1 for a guide. To bring all disappeared partitions back to its original state at once, follow Way 2.

Way 1 - Recover Data and Recreate Partitions on Unallocated HDD

If you use HDD as a data drive for saving multiple files and valuable data, when it becomes unallocated, data recovery on the unallocated disk would be the priority job. Fortunately, HDD unallocated space recovery is possible with the help of powerful data recovery tool.

For getting a time-saving, reliable and risk-free data recovery software, we'd like to recommend you to try EaseUS Data Recovery Wizard. It enables you to effectively perform HDD unallocated space data recovery with its powerful data recovery capacities in only 3 steps.

 Download for Win Recovery Rate 99.7%
 Download for Mac Trustpilot Rating 4.4

# 1. Recover Data from Unallocated HDD

Follow the step-by-step guide to recover your photos, videos, audio files, and documents from HDD unallocated space. Usually, the unallocated space is often recognized as lost partition(s) in EaseUS Data Recovery Wizard.  

Step 1. Scan the hard drive partition

Open EaseUS Data Recovery Wizard, select the hard drive partition where you lost data and click "Scan".

Step 2. Preview found hard drive data

The Filter and Search features can help you access lost files via file types, file names or extensions. Double-click to preview these lost files.

Step 3. Recover lost hard drive data.

Select all the lost hard drive files and click the "Recover" button to save them to another secure location.

Remember to save the recovered files to another storage device before making the HDD reusable again.

# 2. Recreate Partitions on Unallocated Hard Disk Drive

To make the unallocated HDD reusable again, follow the last a few steps to recreate partitions on the unallocated hard disk drive with Disk Management:

  • Step 1: Open Disk Management, right-click on the unallocated space on the disk or external storage device.
  • Step 2: Select "New Simple Volume".
  • Create partition on unallocated HDD.
  • Step 3: Set partition size, new file system - NTFS, drive letter, etc. Click "Finish" to complete creating a new partition.
  • Repeat the process several times if you need several partitions on the HDD.
  • Finish creating partition.

After this, you can save the restored data back to the created partitions and continue using your hard disk drive to save data again.

Way 2 - Recover Partitions with Lost Files from Unallocated HDD

If you are looking for a once for all solution, trying to bring back the lost partitions with data at one time, EaseUS Partition Recovery can help. It supports to fully scan all the lost partitions with data on the unallocated hard disk, and you can even preview the lost partition content before recovering.

Download it and follow the steps below to retrieve partitions with lost files from the unallocated HDD now. Note that activation is required when you need to execute the last recovery operation with this software.


Step 1: Run EaseUS Partition Recovery on your PC.

Select the disk or device where you lost partition(s), click "Scan" to continue.

Select disk to scan lost partition.

Step 2: Wait for the scanning process to complete.

Let the program scan the selected disk and find the lost partition(s).

Scan lost partition.

Step 3: Preview and restore the lost partition(s).

Double-click on the partition which is marked as "Lost" with "Good" recoverability.

Preview lost partition

Preview the content of the lost partition. Click "OK" and click "Proceed" to start restoring the lost partition.

Select found partition to restore.

Step 4: Click "Recover Now" to finish the partition recovery process.

Note: If the program warns you that there is a conflict, back up the listed partition with essential data to an external hard drive first. Then execute the final operation to restore your lost partition.

Finish partition recovery.

To sum up, when your hard drive or external storage devices suddenly become unallocated, stop using the device and follow provided methods on this page for help.

  • For urgent data recovery, EaseUS Data Recovery Wizard is the best choice.
  • To bring back the lost partition with its original state (including the occupied and free space size, file system, partition style, etc.), EaseUS Partition Recovery is a second-to-none tool for you.

Besides, if you have a backup of valuable data on the hard drive, it will be a lifesaver whenever disasters happen. EaseUS Todo Backup Free with its File Backup, Disk Partition Backup features will assist you back up all files at one time in only a few simple steps.

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Updated by Daisy

Daisy is the Senior editor of the writing team for EaseUS. She has been working in EaseUS for over ten years, starting from a technical writer to a team leader of the content group. As a professional author for over 10 years, she writes a lot to help people overcome their tech troubles.

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Written by Roxanne

Roxanne is one of the main contributors to EaseUS and has created multiple posts on digital devices like PCs, Mobile phones, tablets, Mac, etc. She loves to share ideas with people of the same interest.

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