1. Prior Cache location and associated files are not deleted when you adjust the Location in Bridge Preferences. (I just tested it to verify that this was correct, by creating a new cache folder, quitting out of Bridge, and relaunching, and then also returning to the previous cache folder location... nothing gets deleted if you do that). 2. With Automatically Export Cache to Folders When Possible enabled, it will add additional bridge/cache related files to that folder. These will be retained as well, which is a good thing. These files are hidden by default, but can be displayed (View > Show Hidden Files), and will appear as .BridgeCache and .BridgeCacheT files. Caching into
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