Windows 7 and previous OSs provide users with a handy tool which allows users to create virtual drives from folders. This is pretty handy when you want to access your favorite folders quickly. If you aren’t aware of this feature yet, you might want to read up about subst on Wikipedia or use a simple tool to mount your folders as virtual drives.
Subst is definitely a cool tool, however, it does have a problem. If you have named your parent drive (in which the folder resides), you will not be able to give a meaningful name to your new drive. If you have created many virtual drives, your computer drives will end up looking like something in the screenshot above.
This certainly defeats the purpose of creating the virtual drives since it becomes more confusing as to which drive is which, unless you have a very good memory at remembering which drive names you assigned to which folder. The problem occurs because the Virtual Drives created using Subst will inherit the name from the parent drive. Renaming the virtual drives will give you an error as shown in the screenshot above.
So how do you fix it? Well the fix is simple enough to implement and will stick even if you restart the OS. All you need to do is remove the label from the original drive you are creating the subst drive from. Once you have done that, you will be able to rename all the virtual drives you created without getting an error.
Of course you cannot add a label to your original drive anymore, but that is a sacrifice worth it if you add many folders as virtual drives.