Read thisMiniToolguide and you will master several methods to remove drive letter from recovery partition.
By default, this partition is hidden and does not have a drive letter.
If Windows keeps assigning drive letter to recovery partition, what can you do to fix it?
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I have gathered several user-proven solutions from various forum posts and listed them below for your reference.
How to fix the problem of the drive letter changed by itself on Windows?
Here are some useful and easy solutions listed.

How to Fix if the Recovery Partition Keeps Appearing in File Explorer
Way 1.
The steps below are about diskpart remove drive letter.
Typecmdin the Windows search box, then clickRun as administratorunderCommand Promptto run it with privileges.
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Typereagentc /infoand pressEnterto identify what drive and partition the recovery partition resides on.
After that, jot down the following command lines one by one, and pressEnterafter each command.
What can you do if your USB drive or hard drive still appears after removal?

Here are some feasible workarounds you’re free to try.
Way 2.
Step 1.Open an elevated Command Prompt.
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Typemountvol drive letter /dand pressEnter.
Replace the drive letter with the one you want to remove.
After executing this command, the drive letter will no longer appear in File Explorer and Disk Management.

Way 3.
Next, typediskpartand pressEnter.
Then, execute the following command lines one by one:
Way 4.
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Work with the following steps.
Navigate to the following location:
Computer\HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
Step 3.
In the right panel, right-tap the\DosDevices\value that contains the drive letter of the recovery partition and clickDelete.
Step 4. power cycle your machine and verify if the recovery partition is still displayed in File Explorer.
Way 5.
Within 30 days, you could use it to back up your Windows system for free.
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How to delete the recovery partition?
Operate with the following steps.
Open Command Prompt as an administrator.
MiniTool Partition Wizard FreeClick to Download100%Clean & Safe
Launch MiniTool Partition Wizard.
On its main interface, choose the recovery partition and clickDelete Partitionfrom the left menu bar.
Next, clickApplyin the lower left corner to confirm the action.
Hard disk partition was accidentally deleted?