For the fast browsing of content on a USB storage, the Gateway uses an index database stored on the USB drive (GW_DBA.BIN and GW_DBB.BIN files).
When you insert the storage for the first time, the Gateway starts to build the database. Until the Gateway finishes the indexing process you only have limited control of browsing and playback.
This indexing takes a while, depending the storage size, and the number of music files on it. In general you can estimate ~ 1.0 GB/minute.
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