[orbitingpluto]

I remember feeling angry when I learned about the undocumented MBR switch for FDISK. There I was, beginning to learn to spell words with 6 or more letters, thinking I had to use a hex editor to clean up the MBR.

All that effort with no guidance whatsoever that could have been minimized with one extra line of documentation.

[Krasnol]

Weird, FDISK /MBR was actually the only command I knew about.