Okay, thread hijack.
F is usually an accessory drive, which is what got me thinking about it.
30 years ago, I had a 386DX with 4 megs of RAM. Very fast computer, much faster than the 486DX machines that the people I played LAN DOOM with owned, which annoyed them much. How? Start the computer off a floppy with a trimmed down batch file to load basic DOS and drivers for video, sound, and network, which took 700k or so, and create a 3 meg RAMDRIVE which was labelled F:.
Then, run RAMDISK to compress that drive to hold about 7megs of data, copy the DOOM OS and selected levels to the RAMDISK, and run the game completely out of system RAM.
It wouldn't run chkdsk on that virtual drive, don't know why, that was truly above my pay grade.