No, Lightning Server will create a database for each USB disk plugged into ARIES during the initial scan. It will compare differences between current files and previous files on USB drive. The re-scan speed depends on how many music files on your USB drive and how many music files have changed since the last time it was plugged into that ARIES. If no file has changed, it will take about 20 seconds to finish a re-scan for a USB drive containing up to 5,000 tracks. The re-scan speed for any music files, if they have been added, updated or deleted, is about 10 files per second.