It's not a bug, it's user error (or so they say. via 'the wall). Actually, while it may not have been a bug in the operating system, it was certainly a bug somewhere in the mission. That the system depended on a hunk of flash that was being shared between critical system code and stored science data seems like a pretty big flaw in the design. Since when does my PC go into a reset loop because I downloaded one too many images from the Web?