On 13 Apr 2012, at 16:43, cctalk-request at classiccmp.org wrote: KryoFlux was designed to deliver unaltered flux data off floppy disks, making it possible to get the lowest read possible. Certain drives or devices, like the 1541, won't spit out what's on the platter, but interpreted data. This means such data can usually be used (if transferred right) for emulation, but it's usually impossible to write back as copy protection mechanisms usually come with ambiguity or other methods that make it impossible to write such data back to disks. On top of that the 1541 can't read the index, which some protections make use of - when creating a disk. By reading a start mark on track A and then stepping to track B you can try and read a required sequence of data that will be impossible to: a) read in emulation, unless you tweak the data read and spin it around the virtual index as long as it matches. The reason is you don't know which stepping the drive does when reading the disk at the time you image the disk. b) write back to disk, unless you have some aid, e.g. a drive equipped with an index so you can time your writes. There are other things that read back differently (=unaltered or mostly unaltered) through a normal drive. To fully make use of KryoFlux you will a HD 5.25" floppy drive equipped with a -8 stepping mod so you can read flippy floppy disks. If you go for the more hobbyist approach, you can as well add a fake index mod, and read the flip side with wrong index data. Here's some more things to read about the problem: http://forum.kryoflux.com/viewtopic.php?f=3&t=3#p1991 This video explains how to mod a drive... Part 1: http://www.youtube.com/watch?v=WcqluH7dEj4 Part 2: http://www.youtube.com/watch?v=wGxPGavShcE Part 3: http://www.youtube.com/watch?v=aW65ynGGiFk As said above, you need a HD 5.25" drive, which usually needs to be modded. Unless you would want to cut open your disk jackets, remove the platter and place it in a jacket with two index holes. At the moment, KryoFlux will dump C64 disks as .D64 and .D64 with errormap which will allow for using simple protections. More advanced stuff will need .G64 or ultimately .IPF files. .G64 support is being added as I write these lines. Enjoy. Christian Bartsch | KryoFlux Products & Services Limited cb at kryoflux.com | www.kryoflux.com 80 Allington Way | Maidstone | ME16 0HN | United Kingdom Incorporation at Companies House, Cardiff, Company No. 07370567 Directors: Richard Rayner, Christian Bartsch