force flushing when writing to floppy

Hi, I've noticed an annoying thing when writing to floppies. OK, say I'm in a hurry......... I would mount the floppy , and write to it. Then I wait for floopy activity to stop, and issue a umount command and remove the floppy. Sometimes it dosn't get fully written. It seems that the kernel just decides when it wants to write it, sometimes it's right away, and sometimes it waits. How can I force it to do the write immediately? -- use Perl; #powerful programmable prestidigitation