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I know how to copy two files to a disk using partcopy. How would I add a third file to the disk?

I have a bootsector that loads the kernel and I am going to have another program that the kernel switches to for protected mode. I know how to set up the files.

Is there a way to link two files into one?. So that I would be able to copy the two files to the floppy.

Because with partcopy , you can only copy two files and not three.

Would copying the three files to a floppy disk and create a .img file using partcopy and then copy it using rawrite?

I don't know if this is what you mean, but try:

cat file1 file2 file3 > endfile

the dos/win equivalent : copy -b file1 +file2 +file3 allfiles

note that your files will have to be sector-sized (i.e. no 500 bytes file allowed here : only 0,512,1024 ...)