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How to Fix: Partition Disappears in Windows 10 Anniversary Update


Partitions Disappears in Windows 10 Anniversary Update

On August 2, 2016, Microsoft released Windows 10 Anniversary Update and hoping this "update" would literally be a revelation for all users. Unfortunately, users encounter various problems and many users (especially GPT users) are reporting that some of their partitions disappear in Windows 10 Anniversary Update. Let’s see 2 true examples:

Users complain their partition is gone after Anniversary Update
I began installting the update yesterday evening before going to bed. Now I see that my D: partition is gone. In the disk manager it says "149,05GB Unallocated". It is a 160GB Intel SSD. I had most applications installed and all my personal files on this partition.

Windows 10 Anniversary Update Deleted a Whole Physical Disk
So I sit down at my computer this morning and knew that the Windows 10 Anniversary update had downloaded yesterday and had a restart scheduled for 3AM this morning. When I sit down I notice that all of my torrent files were showing 'missing' in my client. No big deal, maybe I just need to re-link them or something. Then I open up Disk Management to see how much space the update took and see that one physical disk is showing 'unallocated'. It would appear at the time of this post that Windows completely wiped/formatted/deleted this drive. Seriously.....wtf Microsoft? Anyone else have anything similar happen? Now I'm off to try and recover everything using Parted Magic. Wish me luck fellow sysadmins...."

--from reddit

Now, I think you will agree with me when I say:
Windows 10 Anniversary Update may affect and even delete other partitions on the same disk.

Well, if you browse social networks like Twitter, forums and Reddit, you will discover that more and more users are talking about "partition disappeared after installing the Anniversary Update" and some of them have successfully solved this problem.

Right now, in today’s post, we will show you 3 ways to help you to deal with this "partition disappears in Windows 10 Anniversary Update" problem.

Tip: Before rescuing the lost partition after installing the Anniversary Update, you had better not create new partitions in the unallocated or free space released by the lost/deleted partition, because recreating partition may overwrite some important files.

Method 1: Roll back to a previous version of Windows

Windows 10 Anniversary Update is finally here. Unfortunately, even though the Anniversary Update promises to be one of the best and most stable releases, building an operating system is a very complex task and partition will be lost after the installation. Thus, some users choose to roll back to their previous version of Windows to get missing partition back. (Here, you might be interested in this Full Guide on Rolling Back Windows 10 to Windows 7 or Windows 8.1 post.)

Although this method can help to reuse the missing partition, we are unable to enjoy the new operating system. Therefore, we had better try other methods to solve this issue "partitions disappear after installing the Windows 10 Anniversary Update".

Method 2: Reset drive letter

Let’s start with a true story. (IanMcKeaveney asked this question "Partition won't mount after Windows 10 Anniversary Update" in Microsoft community.)

Since updating to the Anniversary update earlier one of my partitions won't mount. It's on a 3TB Seagate ST300DM001 HDD which I have split into 1 2TB partition and 1 1TB partition. The 1TB partition mounts fine however the 2TB doesn't, this was working fine before the update in Windows 10 and the drive is using GPT. Disk Management shows this:

partition loss

In this situation, IanMcKeaveney turns to MiniTool Partition Wizard to reset a drive letter for the "disappeared" partition, and then he can use this partition again. Now, you can download the free edition and try it.

Next, let’s see the detailed steps.
Launch MiniTool Partition Wizard.
Then, right-click or click the "missing" partition and then click "Change Drive Letter" or Change Letter button, and select a suitable letter (Here, we take E: for example) in the New Drive Letter list. After that, click "OK" button. (Picture below)

change letter

Finally, tap "Apply" button on the top left corner and click "Yes" to apply pending changes.

Note: You should pay special care when changing the letter of a system partition as changing the letter of a system partition may cause your computer not to boot properly.

"Resetting drive letter may help you get the "missing" partition back. Maybe, you can try it…"

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Although assigning a drive letter with MiniTool or other partitioning tool can help us to access the lost partition in File Explorer, this method cannot solve the problem "partition disappeared after installing the Anniversary Update" perfectly. If we restart our computer, we will find the drive is missing in File Explorer again, and we have to repeat the process again to access it.

Do you need the Seagate recovery software to get back the missing files directly? If yes, please try MiniTool Power Data Recovery.

Or can we try to solve such issues once for all?

Of Course, We Can!

Want to know the best way?

Method 3: Restore lost partition after Windows 10 Anniversary Update

People who successfully deal with the "missing partitions after Windows 10 Anniversary Update" issue do two things very well:

First, they find a professional partition recovery tool.

Second, they recover partition which is lost due to Windows 10 Anniversary Update with this tool.

Now, you might be wondering:

"Which one is best software for partition recovery and how to recover lost partition?"

Here, we’ll show you all answers in order.

The best partition recovery software - MiniTool Partition Wizard

Here, to recover lost partition, you can try using MiniTool Partition Wizard because it offers Partition Recovery feature to help effectively recover partition which is lost due to Windows update, mistaken deletion, virus attack, wrong ghost, sudden power outage, incorrect partitioning, etc. (In general, according to a survey, this software enjoys more than 20 million votes.) Besides, this professional software provides wizard-based operation as well as concise interface, thus even a new user can easily handle it to recover partition and do some other operations like Migrate Windows 10 to SSD without Data Loss to shorten the boot time and enhance the performance of computer. What's more, this professional tool can help to effectively recover partitions for free. Next, let’s move onto the detailed steps on how to recover missing partition after Windows 10 Anniversary Update.

Note: MiniTool Partition Wizard Free Edition can only scan for your lost or deleted partitions. So, now you can download its Free Edition to check whether the target partitions can be found or click the following button to get its Professional Edition to directly recover lost partitions.

Step-by-step guide on partition recovery


First, launch MiniTool Partition Wizard.
Then, click or right-click the disk which is suffering partition loss, and next choose "Partition Recovery" feature from the left pane or from the right-click menu to move on.


Next, choose a scanning range from "Full Disk", "Unallocated Space", and "Specified Range", and then click on "Next" button.

scanning range

  • "Full Disk" is suggested when users do not know where the lost partition was located.
  • "Unallocated Space" is recommended if users haven’t created any new partition after partition loss.
  • "Specified Range" scans specified sectors.

After that, set scanning method for the specified scanning range and then click "Next".

scanning method

In this window, check all needed partitions (including lost/deleted partitions and existing partitions). And then click "Finish" button to go back to the main interface.


WARNING!!! Please make sure you have checked all partitions you need, for the unchecked one will be deleted after partition recovery.

Finally, click "Apply" and tap "Yes" to perform all changes.

Since the recovered partition does not have a drive letter, we cannot access it in File Explorer. To make it visible in "Computer", we need to appoint it with a drive letter. (Please refer to method 2.)

note Tip: If you are having Windows 10 hard drive missing after update issue, try MiniTool Partition Wizard to get back lost partitions.

We also find that many people reported: Windows 10 update deleted my files, my files are missing after Windows 10 update. Under such circumstances, you can actually adopt another tool of MiniTool - Power Data Recovery - in order to recover the lost data easily.

I used this tool to successfully recover missing space.

"MiniTool Partition Wizard can help to recover lost partition after Windows 10 Anniversary Update, and it can also help you…"

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See! With MiniTool Partition Wizard, we can easily and quickly recover lost partition after Windows 10 Anniversary Update without paying any penny. In addition to partition recovery, this professional tool also offers other excellent features to help manage partitions. For instance, it can help to enlarge the Windows partition when it is running in low disk space, and you can get more information from our precious post 3 Ways to Help You Get out of Low Disk Space Warning in Windows 7/8.1/10.

Necessary Tips for Windows 10 Anniversary Update

No doubt, Windows 10 Anniversary Update is the beginning of a new era. This is a huge update that touches every corner of the operating system.

Nevertheless, before installing the Windows 10 Anniversary Update, you had better back up all important data in the event of any problems occurring, for Anniversary Update will cause various problems, and one of the worst issues is that Windows doesn’t show partitions on hard drives correctly at times.

Now, you might be wondering:
"How to back up all data quickly and effectively?"

As a matter of fact, when it comes to making a backup of all Windows data, you can try using MiniTool Partition Wizard since it offers the "Copy Disk" feature to help to effectively clone one disk to another to make a backup for the disk which saves significant files.

I used this tool to make a copy (Clone MBR disk to GPT) to back up all important data.

Here, last but not least, we also want to share another tool, MiniTool Power Data Recovery, for you, since some people are concerned about their data is loss with missing partition after Windows 10 Anniversary Update, as the following picture shows.


In fact, there is no need to worry. Because the missing partition caused by Windows 10 Anniversary Update is still on the computer, but there is something wrong with its partition table. As a result, you cannot see it. In a word, to solve the "partitions disappear in Windows 10 Anniversary Update" issue, you can only turn to the partition recovery feature in MiniTool Partition Wizard.

On the other hand, if you still worry about data loss problems, you may try MiniTool Power Data Recovery since it can help to effectively recover data that have been lost in a variety of ways. (As long as file loss is not caused by hardware failure and lost files are not overwritten by new data, you are able to recover them with this tool.)

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Bottom Line

After seeing the above introduction, you might have a basic understanding of how to deal with this "partition disappeared after installing the Anniversary Update" issue.

In general, although there are 3 ways to help to deal with the "partitions disappear in Windows 10 Anniversary Update" problems, the last one might be the best choice for most common users since MiniTool Partition Wizard can easily, quickly and effectively recover lost partitions and lost data at the same time as long as new partition hasn’t been created.

Should you have any questions or doubts about our suggestions or have better ideas, please let us know via leaving a comment below. Much appreciated!