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Free Recover Data from an Unallocated Hard Disk Space

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    Summary: sometimes we may delete hard drive partitions mistakenly, and want to recover data from the unallocated hard disk. This post tells the most effective way to recover unallocated hard drive.

    Partition Is Missing

    Issue: I have a 1TB external hard disk which was partitioned to 3 partitions. Without knowing what happened, one of my partitions got lost and became unallocated. All my precious photos are saved on that drive (I’m a photography lover), so please tell me how can I recover data from an unallocated hard disk space. I have googled and was told to use data recovery programs. Nevertheless, recovery apps I found on the internet are expensive or just allow me to recover limited files, so I desperately want to know whether there is a free or relatively economical solution.

    Why the partition is missing?

    General speaking, partition or partitions may get lost or disappear due to various reasons, such as virus attack, mistaken deletion, sudden power outage, incorrect partitioning, and more. In addition, the lost partition will be shown as unallocated space just as the above issue mentioned. To recover the important data from a lost partition, you should apply a piece of third party software. Here, MiniTool Partition Wizard is a good choice.

    This software is a piece of reliable and professional partition manager with multiple functions such as creating/deleting/formatting partition, migrating system, copying disk/partition, file system conversions, disk type conversions, partition recovery, and more. In addition, this software is compatible with Windows 10/8.1/8/7/Vista/XP 32-bit and 64-bit. To recover data from lost partition, you can use its function "Partition Recovery". And this feature is available in Professional Edition and the advanced editions. Here I will operate it in Professional Edition.

    How to Recover Lost Partition with MiniTool Partition Wizard

    If the target partition – whether it is a primary partition or a logical partition - is lost or deleted, it will show as an unallocated space on MiniTool Partition Wizard. So the following steps are mainly focus on recovering data from an unallocated hard disk space.

    Step 1. Open the software to enter its main interface. Then select the hard disk which contains the lost partition, and then click on "Partition Recovery" from the left action bar.

    partition recovery

    Step 2. There will be a "Scanning Range Settings" interface and three kinds of scanning ranges are listed here: "Full Disk", "Unallocated Space" and "Specified Range". Choose one type you want to use and click "Next" to continue.

    scanning range

    Step 3. There are two scanning methods on this interface: "Quick Scan" and "Full Scan". Read their introductions, choose one method you want to use and click "Next" to continue.

    scanning methods

    Step 4. On this interface, choose the partitions you want to save including existing and lost/deleted, because this software will delete the partitions which are not chosen. In the "Preview" bar, you are allowed to preview the partition recovery effect. Then, click "Finish" on the lower right side to go back to the main interface again.

    choose searched partitions

    Then, you may notice that the recovered partition has no drive letter. To make it display on your computer, you should arrange a drive letter for it, and this software still can do this work for you. Just follow the next steps to achieve this aim.

    Step 5. Select the target partition and choose "Change Drive Letter" from the left operations bar. Then you will get a pop-out window as following. Choose a new drive letter and then click "OK" to go back to the main interface.

    change drive letter

    Step 6. Click "Apply" to save the changes at last.


    After these 6 steps, the lost/deleted partition will be back to your computer again with all data kept well on it as long as they are not damaged or overwritten, and you are able to use these data directly. Now have a try on this partition magic software!

    Here is a video that demonstrates partition recovery process intuitively.

    If you really can’t find the lost partition by using MiniTool Partition Wizard, you’d better try a piece of dedicated data recovery software. MiniTool Power Data Recovery is your best option, and its recovery module "Lost Partition Recovery" can assist you to recover the lost partition.

    Tweet Your New Skill

    In some situations, you may lost the system partition which will cause the computer can’t boot normally. If this happens, you can use MiniTool Partition Wizard Bootable Edition to solve this issue. Here, the Bootable Edition is created by MiniTool Bootable Media Builder, which can be found in MiniTool Partition Wizard Professional Edition.