Dreamcast GDI Compatibility List

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For flash drives (SD and CF), I'm especially recommend using optimized GDI (iso tracks instead of bin), because it's has a small delay between the data requests which are arranged in series. Do disk drives (HDD/GD) it is faster because helps the device cache for it (the following data has been read into the cache, because the disk is spinning).
Data from BIN tracks, reading with 3 requests, in contrast to the data in the ISO tracks that are read by one request (omitting the file system).
For this reason, the size of the cluster in the file system recommended to do maximum size.
And for the DMA transfer I'm especially recommend use optimized GDI (for all devices), because in this case, sectors of images are located exactly sector by sector of the file system, so for DMA transfer creates less "noise" (errors), because of which we have to use PIO mode in some places.
In general, all of this suggests that it is better to use the optimized images are always and everywhere But of course, in most cases the difference is not significant for the games, as the speed enough without it (on IDE devices of course, not on SD).