How to mount... (for more information, read readme.txt)
Floppy - mount a a:\ -t floppy
CD-ROM - mount d d:\ -t cdrom

Thinking. Why not make mounting drive a: and b: as floppy by default?
One less reason to ask such questions on forum.

Srecko: I am sure you haven't checked how it works by added it to your autoexec section before asking 😉

Other thing is using real floppies is slow and rarely necessery. Mounting d:\floppy is way faster and more convinient.

A person will still have to know how to mount hdd and cd. (will have to read readme for other things too)

Robert, you can "mount a c:\flappy -t floppy" too...

zorbid: yeah i have red the readme 😉

Answering to the second question: It should be as long as the usb drive is properly recognized and mounted on your OS.

My thought was: if anyone wants to mount drive at mount points a: or b:,
dosbox should automatically add "-t floppy" (unless if explicitely overriidden by commald line parameters).
Those drive letters were only used as floppy drives (AFAIK).

CD-s unfortunately don't have preferred drive letter and hard drives are default mount option 😀

well CDDrives ALWAYs came after the HardDrive letter partitioning. Always. (Still do btw) And I've being noticing in some games that I've played Drive recognizition is not always working. Like It lists all drives from A: to Z: as if they all were working instead of the drives that are mounted. I remember having to set in my Autoexec? or Config? When I used to use DOS, I remember (something like this) SET LASTDRIVELETTER=H but I never understood fully why I needed to set this.

@priestlyboy, I think it was just SET LASTDRIVE=xxxxx, and I think it was just a way to reduce the memory footprint of some internal DOS table.

it is LASTDRIVE=X and LASTDRIVE=D is default, so if you want to use E or more you have to add it to your config.sys