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It's not. I already explained why. But if you're willing to deal with the 12-bit strangeness, all right... If you don't want to write the code, you can just mount the filesystem and use it...

I...

Your virtual floppy disk, like any floppy disk, is FAT12, not FAT16. Look closely at your dump:
00000000 eb 3c 90 6d 6b 64 6f 73 66 73 00 00 02 01 01 00 |.<.mkdosfs......|
00000010 02 e0 00...

Floppies use the FAT12 filesystem, which is good at not wasting space, but very hard to use. Its FAT entries are, as the name suggests, twelve bits in size. That's one and a half bytes, like this: ...

The way you're using it, it contains no "files". A block device is nothing but a giant pile of undifferentiated blocks, ordered from first to last.

If you want to create a file in it, you have to...

'man 2 creat'

creat(2) operates on file descriptors as does the rest of the stdio.h calls - give the manpage a view.

-or-

you can OR the O_CREAT flag with O_RDWR in open(2) to create the...

These commands all have man pages accessible with 'man 2 open', 'man 2 read', 'man 2 write'. Also lseek.

#include <sys/types.h>
#include <unistd.h>
#include <sys/fcntl.h>
int main(void)
{
...

Check the perms on /dev/loop0


ls -l /dev/loop0

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No flames,...