"CD Drive (F) Virtual CD" may be some optional/bundled software that came with the drive, ie: backup, photo management/editing, oddball drivers,etc. This isn't uncommon to see the 'bundle", but seeing it as a Virtual CD is somewhat unusual AFAIK. That might be Tosh's funky way of doing it.
I can see some reasons for using the Virtual CD method. One of them is making the drive "autoplay/"plug and play"/"self-installing".
The usual "NEED MORE INFO" plea..
What model of Tosh ext HD? (that way us readers can look up the specs)
What operating system? (Depending on which, there may be better ways of "looking at the drive" to see what's really happeningEDIT:
Edited to remove derogatory remarks. ~tg