[android-developers] What does the mediascanner do?

I am trying to understand more of what the media scanner does so I can
live in harmony with it.

Recently, a customer says that when opening my app, he frequently gets
a notice that "Unfortunately, the process android.process.media has
stopped".

Is there anything that commonly causes the mediascanner to crash, run
out of memory, etc? So far, I found this to be mentioned on the
internet where there are custom roms and the storage card is filling
up but not quite full.

Does it create locks on files or folders, where if I am extremely
lucky, my app will come into conflict with it?

Does it delete certain files that it doesn't think the user needs in
order to save space?

Will it choke if it comes across a file that happens to have an
extension that usually means an image/media file but is not actually
decipherable in that format?

Thanks

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