Bug 14736

Summary:	Probelm of dd with a protected floppy disk
Product:	Base System	Reporter:	ota <ota>
Component:	bin	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	Unspecified
Hardware:	Any
OS:	Any

Description ota 1999-11-06 06:10:01 UTC

When dd tries to wrote to a protected floppy, the system crashes.

How-To-Repeat: Normal operation with a write-protected floppy:
dd if=boot.img of=/dev/fd0

Comment 1 Poul-Henning Kamp freebsd_committer

1999-11-06 10:22:54 UTC

State Changed
From-To: open->closed

You should have used the raw device: /dev/rfd0. 
The underlying problem is well documented in other PRs.