In the "golden era", I developed together with a friend many routines to copy and to protect disks, using special formatting and manipulating crc errors and sector sizes.
Days ago, I started reading my codes, so I can make a way to generate some image from the protected disks.
I will read more about DMK format to adapt my routines.
Happily 90% of brazilian disk drive interfaces are WD2793 based 
The tool that Wouter is developing runs on MSX only (no need for old PC's). The resulting files will be combined to a single dmk image on a PC.
Does your HB-3600 have 2 drives? (Current version needs 2 drives... but also that will probably be improved later.)
If you want to help testing, please join us on the openMSX irc channel, #openMSX on FreeNode.
Note that there have not been done any tests on 5.25" disk drives yet... so it may not work at all 
There is no support yet for I/O mapped interfaces, but that will not be too hard to add, Wouter told me.
If someone has the original disk of Galf Streem, please speak up here
