How to Fix Unallocated External Hard Disk Drive

Unallocated disk can make data inaccessible and lost for good. Take a minute here. We will walk you through how to fix unallocated hard drive and recover data from the disk.

Nov 13,2019 • Filed to: Answer Hard Drive Problems • Proven solutions

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External hard drive Unallocated

Today, I plugged my Toshiba external hard drive into my computer, but I can't find it. And the disk management said that my external hard drive is unallocated. Any suggestion for hard disk unallocated repair? Many thanks.

Almost anyone uses external hard drives to save precious data or to extend the storage capacity of their Computer. But like an internal hard drive, they can become unallocated. Without allocation, you are unable to write, read and store data on the unallocated disk. If you want to access your data on it, you might need to fix the unallocated hard drive and then recover files from the external disk.

Get through this article and get to know how to fix unallocated hard drive without losing data.

  • Part 1: How to Fix Unallocated hard drive with CMD
  • Part 2: How to Recover Data from Unallocated hard drive
  • Part 3: What Does Unallocated Mean

Part 1: How to Fix Unallocated hard drive with CMD

Attempting to fix unallocated external hard drive on it can be difficult but not impossible. Before searching for powerful tools that are specially designed for such occasions, you could try to fix it by using CMD and more specifically "Diskpart". Here are the steps:

Note: This method will erase all data on the external hard drive but it can make it reusable. The good news is that you are still empowered to get the erased data back by using a hard drive data recovery program.

  1. Open CMD (press the Windows key + R and type CMD then hit enter)
  2. In CMD type: Diskpart and hit enter
  3. In Diskpart type: list volume and hit enter
  4. Type: select volume X (X being the drive letter of your unallocated external hard drive) then hit enter (you can find out which Drive letter is assigned by looking in Disk Management)
  5. Type: delete volume and then hit Enter
  6. Type: list volume and then hit enter (If the tool is not able to create a new volume, follow the steps below)
  7. Type: select volume X and then hit Enter
  8. Type: delete volume and then hit Enter
  9. Type: delete volume override and then hit Enter
  10. Open Disk Management and try to create a new volume on the unallocated drive and set the file system to get the unallocated hard disk repaired.

This method might or might not work, depending on what has caused the hard drive to be unallocated.

If you are not sure if your hard disk is unallocated, you can move on to Part 3 to learn what an unallocated hard disk is and what causes a hard disk to be unallocated.


Part 2: How to Recover Data from Unallocated hard drive

1. Perform Hard Drive Data Recovery with Recoverit

The method above can bring back to life your unallocated external hard drive in most cases, depending on the cause of the issue. However, it also deletes everything on the hard drive and it cannot be recovered afterwards. Luckily there is another method which besides the fact that will repair your hard drive, it will also recover your valuable data. The software is called Recoverit Data Recovery and it has brought immense improvements in data recovery solutions.

hard drive data recovery

Your Safe & Reliable Hard Drive Recovery Software

  • Recover lost or deleted files, photos, audio, music, emails from unallocated disk effectively, safely and completely.
  • Supports data recovery from recycle bin, hard drive, memory card, flash drive, digital camera and camcorders.
  • Supports to recover data for sudden deletion, formatting, hard drive corruption, virus attack, system crash under different situations.

2. Video Guide to External Hard Drive Recovery

No matter your external hard drive is unallocated, uninitialized, unrecognized, formatted or crashed, you can get Recoverit Data Recovery to get your files back without further damage to them. Now, watch the video and get the file recovery steps.

3. How to Recover Unallocated Hard Drive

Download and launch Recoverit Data Recovery on your computer, and follow the next steps to recover data from unallocated external hard drive.

Step 1Select a data recovery mode. To recover data from external hard drive, you can select "External Devices Recovery" mode to start.

select external devices recovery mode

Step 2 Connect the external disk. Make sure your external hard drive has been connected to and can be detected by the computer.

connect external devices recovery to the computer

Step 3 Select a location. Choose the connected external hard drive you wish to recover data from. Click "Start" to scan lost data.

select external hard drive

Step 4 Scan the unallocated disk. Recoverit will firstly launch a quick scan on your unallocated hard drive. You can also go to "All-Around Recovery" mode to deeply search more files from hard drive, but it will take more time.

scan with All-Around Recovery

Step 5 Retrieve the lost data. After the scan has been completed, you will be able to preview your files. Select the wanted ones and click "Recover" to get the files back.

preview and recover data


Part 3: What Does Unallocated Mean

What is unallocated space on a hard drive

When trying to use an external hard drive, after being plugged into the Computer, you notice that the drive doesn’t show up in “This PC” (windows 8 and 10) or “My Computer” (Previous Windows versions). You do a bit of extended search to see what is going on. In Device Manager under “Disk driver” it says that the “Device is working properly”. After that you check in Disk Management and see that the Drive is healthy. However, it also says “Unallocated”. This can happen to a single partition. If there are more than one, it can happen to the entire Drive.

Then, you might be curious about the impact of unallocated space on hard drive to us when using the hard drive, external or internal.

In fact, data can be only written, read and stored into allocated space on hard drive. Unallocated space, also referred to as free space, is an area where you can't access the stored data and write new data. So if you find the external hard drive unallocated, you should fix it and recover data from the external drive in the least possible time in case all important data present it get gone forever.

Reasons for Unallocated Hard Drive

There are many reasons that can cause this unusual behavior and in many cases not even an expert can figure out why it happened. Some of the known issues to cause a hard drive to become unallocated include:

  • Infection with a virus or spyware
  • The hard drive is suddenly disconnected from the power supply
  • Partitions were created or modified incorrectly
  • Installing an additional hard drive
  • Hardware failure
  • Outdated Drive

Closing Words

Hard drives help us store our most valuable memories. Whenever they fail for various reasons, every picture, work data and even music collections that have been gathered throughout the years are in danger to be lost forever. Luckily, Recoverit Data Recovery is the exact professional tool to help you recover data from hard drive, so that we can enjoy them forever.

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