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#160
Do you mean that you can't install games or programs to it?
If so, that's normal. You usually can't install to an external drive. An external drive is typically used for a data drive.
Let's see a screenshot of Disk Management showing this drive in it to see if anything may stand out.
Just to be extra safe, I would recommend to copy everything on the external drive you don't want to lose to another drive in case there is an issue with it.