FSCK - Suite of programs for RISC OS that are able to analyse and fix E-Format discs. - http://www.monesi.com/sergio/fsck.html
DiscKnight - Disc checker and fixer for FileCore E and E+ format hard discs which incorporates fixes for 64 different problems. Demo version available for download. - http://www.armclub.org.uk/products/discknight/