I don't know how thorough you want to be, but msdos 5+, and some versions of both opendos and ptsdos, you can actually have more than 26 drives, up to 32 if I remember correctly. I saw (once) which characters they used for the additional 6 drives, but I don't remember what they were. Looking in the ascii table beyond capital letters, you have [, ], \, `, and ~. I'm fairly certain the backslash character wasn't used, but I think the | (vertical bar) was, so perhaps that's the additional symbols, but if you want to cover those drives, you'll of course need to check. :) Of course, the number of folks running dos these days that have more than 26 drives is vanishingly small, so it's probably a nonissue, but just thought I'd raise the issue anyhow.
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