MS-DOS debug -l 0 not working

I want to write a bin file to a flash drive. I'm supposed to run:

n helloworld.bin
l 0
w 0 0 0 1 

But when I run l 0 I get a Fi开发者_StackOverflow社区le not found error. What am I doing wrong?

Two issues:

• MS-DOS filenames should have a maximum of 8 letters before the dot and a maximum of 3 letters after the dot.

• For this use of the l command in debug, provide no parameters. The file will always be loaded to CS:0100.

(I somehow find it worrying that my brain saved this useless information for all those years...)