question about boot disk for Linux ?

[john]

After creating a linux boot disk, this floppy can only
be mounted with filesystem msdos.

When trying to mount it as ext2, the following message
is given:
mount: wrong fs type, bad option, bad superblock on
/dev/fd0 or too many mounted file systems


Why ? Once a boot disk is created by Linux, I guess it
formats it with ext2 file system before it puts the
required files like vmlinuz, initrd.img etc ? 

What is the file system for the boot floppy created by
Linux ?

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