I made a bootloader that loads a second stage from floppy disks and the second stage is more like a "Hello world" program
I compiled:
nasm -f bin boot.asm -o boot.bin
nasm -f bin stage2.asm -o stage2.bin
Then I made virtual floppy drive A and I copy the stuff...
copy stage2.bin A:\stage2.bin
I make it bootable with
partcopy boot.bin 0 200 -f0
All works, but after that if I try to go to drive A, it says "unknown filesystem" and if I run the command format A:, it says the current filesystem is RAW and the new filesystem is FAT12
If I format, I lose the stage2 and the bootloader. When I put them back, the same thing happens again and again...

Any help please anyone? Thanks in advance!