KryoFlux device writing is not supported #22
Description
It's possible to read directly from KryoFlux devices but not write to them, as only the read commands are understood.
The KryoFlux device creators do not provide a library or any documentation on how to drive the device from 3rd party software. The only officially supported method is to use the dtc application, either directly, or spawned from 3rd party applications to do the work. This gives little control over the process and is not an attractive solution for SAMdisk.
The only alternative is to reverse-engineer the USB protocol used by the dtc application and use the same requests directly. This has been completed for reading support only, with further work required to identify the commands and surrounding behaviour. The limited on-board buffering also requires USB streaming mode to be used to keep sufficient buffers queued up to avoid underflow during the process.
The current lack of write support is mostly due to the effort required to reverse-engineer the remaining device commands, and the availability of a fully documented competiting product (SuperCard Pro), which already supports writing.