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Free Recover Data from an Unallocated Hard Disk Space

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    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. To recover data from lost partition, you can use its function "Partition Recovery". Fortunately, this feature is available in its Free Edition. So, you can download and install this freeware to your computer, and let it assist you to retrieve data from the lost partition. In addition, this software is compatible with Windows 10/8.1/8/7/Vista/XP 32-bit and 64-bit.

    How to Recover Lost Partition with MiniTool Partition Wizard

    Since the lost partition is marked as unallocated space, retrieving data from a lost partition also means recovering data from an unallocated hard disk space. Then, see how this partition recovery freeware works for you from the following step-by-step guides.

    notice Notice!

    Don’t create new partition on the unallocated hard disk space once you discover that the partition is lost or deleted accidentally to avoid data overwriting which may cause data unrecoverable forever.

    Step 1. Open and launch MiniTool Partition Wizard to enter the main interface. Then select the hard disk which contains the lost partition, and click "Partition Recovery" from the left operations bar.

    partition recovery

    Step 2. You will see a pop-out window with "Scanning Range Settings" as follows. There are three kinds of scanning ranges on it: "Full Disk", "Unallocated Space" and "Specified Range". Choose one type you want to use and click on "Next" to continue.

    scanning range

    Step 3. There will be a second pop-out window which shows two scanning methods to you: "Quick Scan" and "Full Scan". Read their introductions respectively, choose one method you want to use and click on "Next" to continue.

    scanning methods

    Step 4. On the third pop-out window, 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 on "Finish" on the lower right side to go back to the main interface.

    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. MiniTool Partition Wizard Free Edition 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. You will see that the target partition owns a new drive letter now. Then, you need to click on "Apply" to save the changes.


    After these 6 simple 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.

    Here, you also can learn how to recover data from an unallocated hard disk space with “Partition Recovery” function of MiniTool Partition Wizard Free Edition from this video:

    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 Disk to solve this issue. See the specific steps in this post: Is your system partition lost? Is your computer unable to start? Choose Bootable CD to help you.. You will find this tool is really useful.