Suggestion
Split these up first in audio OR sound (the audio-volume tag is too specific) and logical-drive.
Make volume a synonym of logical-drive.
Reasoning
You can't have a single question about volume, volume will always be interpreted as ambiguous even when you do keep the tag and write as much in the information of the tag as you want. In other words, it does not solve the problem that we are having now; we don't want ambiguous use of volume.
We have to find two tags that better fit the purpose, one of them should be logical-drive. People that don't know about it will type volume and wonder why this tag comes up; then they read a short description and they will know that logical-drive is what they want. The definition can be extracted from a online dictionary like Webopedia, which explains this term very well:
logical drive
A part of a physical disk drive that has been partitioned and allocated as an independent unit, and functions as a separate drive altogether. For example, one physical drive can be partitioned into drives
F:,G:, andH:, each representing a separate logical drive but all still part of the one physical drive.
Using the logical drive hierarchy is one method of organizing large units of memory capacity into smaller units.
As for audio, do we actually want a tag that's called volume or audio-volume? Isn't it OK to just categorize these under audio OR sound? I don't think that the volume tags have any benefit while searching, and I think that a question that's only about the tag audio-volume can't exist.
Now the only question for this last paragraph is whether we want audio or sound...