Copying data from a disk to a turtle

So I've written a program for my turtle, saved it on a floppy, and put it in a disk drive next to a turtle.

I tried to copy the program to the turtle like this: cp slave rom

It said copy:13: Access Denied.

Obviously, I'm not sing the correct file path.

What IS the correct file path?

You cannot copy stuff to rom.. its read-only-memory
it should be
cp /disk/<progondisk> <prog>

to copy <progondisk> from disk to <prog> on turtle
(without the <> ofc)
and to copy to disk ofc

cp <prog> /disk/<prog>

Thanks.

could you give an example please, (i'm not good with computercraft)