I feel both these tags have similar scope. So should we merge these tags?
Examining the questions in the drive tag reveals that its scope is, as might be expected, broader than the scope of hard-drive. After all there are various types of drives that wouldn't usually be called "hard drives", such as floppy disks, USB flash drives, solid state drives (SSD) and so on.
Perhaps the tag drive has excessively broad scope. My preference would be to review the questions with that tag and retag them with more precise tags for specific types of drive, such as hard-drive, or remove the tag where it is not descriptive of the question's subject.