eCSoft/2

File-system display & analysis utility. Shows partition-tables and bootsectors. Shows all HPFS internal disk structures like Superblock, Fnodes, Dirblocks etc. Check allocation integrity for volume. Can find any data-sequence on the disk and identify the file it belongs to. Display allocation maps for entire disk and for the directory-band. Includes UNDELETE for HPFS and supports JFS.

DFSee, Display File System is considered one of the best professional programs on the market to maintain disks and volumes.