it is used in android phone. Because my ROM is big enough(around 8G), and my SDCard has been full with various files, so i want to link a big file stored in ROM to SDCard so as to save the treasure space of SDCard( the big file cannot be identified by a software except it is in /sdcard patition ) first i take an test to validate the method: try to link a file /data/test.mp3 to /sdcard/test_fat32.mp3, then in the terminal (#su), i tried to make a symbolic link like this :
ln -s /data/test.mp3 /sdcard/test_fat32.mp3
ln: /sdcard/test_fat32.mp3: Operation not permitted
Googling for a while, and i found that i cannot create symbolic links with fat32, i dont want to format the SDCard to ext4, because i want to make such an app to share with my friends. you surely cannot demand everyone of the format, what's more, maybe many apps cannot identify ext4 files. does anyone have a good idea to realize it? or some other ways to access inner files and fake the app that it is a file in /sdcard? any help appreciated!