Which directories does the Media Scanner scan at startup?
Is it only the sdcard?
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Media Scanner scans both SD card as well as USB storage, but not ROM and system storage. Means, it scans from
/sdcard/external_sd/ mount points. It goes deep inside all non-hidden sub-directories, unless
.nomedia file is detected.
Media Scanner skips ROM and system storage because both require root permission to write anything there. And, its very unlikely for an end-user to store music, photo there.