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The 'zoom-data' is stored in the local databases that are in each folder. They are called metadata.db. See the 'application_data' table, which contains a list of file_id/key/value entries. The 'file_metadata'-table can be used to link the file_id to a filename.
The zooming factor is stored in keys named: 'uds_zoom_factor'.
When 'Indexing files' is shown on the display, a program called mdbindex is executed. The sources are in iRex\Sources\4.0\iRex\ctb\src together with the source code of ctb. See the makefile to see which files are used.
The main functionality is in a function called index_full() in the file index.c. Which first reads all data from global.db, then all data form the SD-card and then updates global.db with all changes (added files/removed files). It does not touch the local metadata.db files, so zooming factors are not modified.
I hope this information is usefull.
So next steps is to try to figure out how the uds_zoom_factor is used by UDS.
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