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What’s your question ?
If it’s “how did an engine library get onto my usb sticks/drives, when I don’t use Engine desktop?” Then it’s because the players analyse the track when a new track is loaded onto the player and that analysis data is stored in a database on the usb drive. If one’s not there already, the player will create/save one
On the hardware Engine OS creates a database automatically when you use a USB/SD device. Tracks that have been loaded fo deck are added to that database and things like waveform, cues etc are saved and the track will be added to the search index. To bulk add tracks it would be recommended to use the Engine DJ Desktop version