Board Thread:Questions and Answers/@comment-63.234.175.154-20130114161225/@comment-23270394-20131207024327

Redpower has a problem with NEI, where many items with the same base data value don't show up. For example, all redpower ores use the root 254, but only ruby can be found (data value 254), since the rest are 254:1 etc. The blank floppy is 5583, and the boot disk is 5583:1, so it isn't listed.