Hmm, I have some ideas:
After open TRD file will this file(image) save to IDE as 2x longer image (each 512bytes sector contain only 256bytes of each trdos sector and second 256 bytes can be unused (fill with zero value). TR-DOS with IDE support will work only with this converted files (lenght 2x640kB=1280kB). After eject disc(close work with image) can user save image to original TRD(rewrite) or ignore all changes.
Next idea is use small swap ZX memory for use as buffer for IDE sector....





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