Hi Jon
The dfsee files are all free to download, install and use - for a short period of time. If you need help sorting out a disk problem then you will need to Register as Support is not free. I can say that dfsee support is very good as he (Jan) recently helped me rescue a disk that others thought was dead.
I would not bother using Windows/linux based disk tools as most, if not all, simply do not work with OS/2 systems.
Regards
Pete