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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 my 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: virus attack, mistaken deletion, sudden power outage, incorrect partitioning, and more. To recover the important data from lost partition, you should apply a piece of third party program. Most of the time, you want to find a partition recovery freeware at first. So, it’s necessary for you to know this program – MiniTool Partition Wizard.

    MiniTool Partition Wizard is a piece of 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 the function "Partition Recovery". Fortunately, the Free Edition owns this function. You can download it on your computer to assist you to recover the lost partition.

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    Tips: MiniTool Partition Wizard Free Edition supports OS: Windows 10/8.1/8/7/Vista/XP 32-bit and 64-bit.

    Please notice that, 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.

    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 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. 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

    On the main interface, 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. So, just do the following two steps to make it.

    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.

    If you really can’t find the lost partition by using MiniTool Partition Wizard, it’s time for you to try the dedicated data recovery software. MiniTool Power Data Recovery is a good choice, and its recovery module "Lost Partition Recovery" can assist you to recover the lost partition.

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    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 CD 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.