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Originally Posted by tompe
I have met a lot of people that do not understand things like "create a new map and copy the file to the new map" because they do not have a correct conceptual view of files and file systems.
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If you use strange terminology instead of the terminology ("directories" or "folders") that's been in use for over 35 years of computer use at the consumer level, sure there will be confusion. (ie, what the hell is a "map" in this context?)
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I thinks this is much harder than you think. What should happen if you plug-in an SD card that happens to have photos on it?
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Check for the app's (or a system-standard) metadata file on the card, then quickly scan for differences and update the metadata appropriately. If no metadata file, do a full scan for the appropriate file types and create one.
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What shoud happen when you remove the SD-card which have photos you have tagged or referenced in other applications?
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The application would no longer show them, obviously.
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How do you find the important data files for an application
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Check local repository for the files, then check removable media, if any. Not difficult. If you mean the user, give them a little credit - they're smart enough to know if they want to use their pictures or videos that are on an SD card (say, from their digital camera or phone), or USB drive, on a device that they should actually plug the card/drive in.
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and what happens if you plug-in an SD card so you have two copies of the application specific file? And so on.
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If the application isn't smart enough to be able to deal with a local copy of its metadata and the copy on removable media, its programmers need to be flogged for not having basic programming skills and putting out crappy software.