I've used it myself to repair iPods that had been borked by installing iPodLinux on them, rescue the most possible data from hard disks with defective sectors, analysed Flash (.flv) files and much more. It can even access disks remotely over internet.
If you know your bits and bytes, have a look at this tool. It runs on Mac OS X, Windows and Linux, thanks to it being made with REALbasic.
- Can view disks in custom block sizes.
- When modifying data, a "journal" file is written to more...
- Fixes a few Microsoft Windows-related issues. Mac version remains unaffected.