This is what I found out during early day of beta testing last year.
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usb/ data disk play back follows the file created time not the filename order. Basically, FIFO. - first copy in, will be first playback.
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also did a non scientific “response time” counting from disk start to spin to the display show track
- Music CD. 13 tracks. 7 seconds
- Music SACD 12 tracks 7 seconds
- DVD+RW. 4 tracks 22 seconds
- DVD-R. 18 tracks. 17 seconds
- DVD+R. 32 tracks 57 seconds.
In my opinion, PST is primary designed as SACD/CD transport for DSDAC. And with Octave Music Player | PS Audio in the pipeline, supporting the music data file playback in PST is secondary.