How to manually assign a drive letter to a shared Mac folder or volume

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Automatic Letter Assignment

In addition to sharing macOS folders and drives to the virtual machine, Parallels Desktop lets you automatically assign letters to them.

There are 2 options that control that, and both are located in the virtual machine's configuration > Options > Sharing > Share Mac.

1. The first one is called Map Mac volumes to Windows

 

If this option is enabled, all volumes — mounter disk images as well as physical drives connected to your Mac — are:

a) Connected to the virtual machine;

and

b) Assigned a letter.

2. The second option is located under Advanced, and is called Assign a drive letter to shared folders.

With this option enabled, macOS folders shared into the virtual machine — such as Home, iCloud, or any other folder you may wish to share manually through the Custom Folders option — will be automatically assigned a letter.

Manual Letter Assignment

If you wish to manually assign a particular letter to a Mac folder or a volume connected to your Mac, you need to do the following.

Make sure that the drive/folder is being shared

By default, only macOS Home folder and cloud folders are being shared to the virtual machine. Open the virtual machine's configuration > Options > Sharing > Share Mac > Share folders. There, you can click Custom folders and select a folder or a whole volume that you wish to share with the virtual machine.

As a result, the drive resource will be available in the virtual machine. However, a letter will be assigned automatically.

On this screenshot, it is even assigned a letter twice:

Disable Automatic Letter Assignment

Although this step is not necessary, it will prevent you from having duplicates that are shared automatically.

1. Open the machine's configuration > Options > Sharing > Share Mac > Advanced and uncheck Assign a drive letter to shared folders.

2. And for volumes, uncheck Map Mac volumes to Windows.

As a result, your shared folder/volume will only be available as a network resource without a letter assigned.

Manually Assign a Letter

Now, all that's left is to right-click on the resource > Map network drive... and proceed with assigning a letter.
 

The resource will be permanently assigned to the letter you select.

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