This might be considered an undesirable security hole. This lets it access any file, and read the raw device data to recover deleted files. The PC has complete access to the exported storage, below the filesystem level.
#Android file transfer mac not working android#
Android can't enforce any filesystem security. It's more convenient that way because you don't have free space split between partitions, but you can't use USB mass storage on only a directory. 
Newer Android devices often just have one big partition, and the "external storage" is simply a directory there.
This also means there has to be a separate partition and filesystem for the external storage, which the phone can cope with losing access to. There's no way for the phone to let the PC access the internal storage this way: Android can't unmount the internal storage, because all apps need access to it, even the system apps. When the external storage is unmounted from the PC, Android has to rescan it from scratch (see media-scanner) because it can't tell what has changed. Music and other files on the external storage aren't accessible to apps, so even apps that aren't on the external storage might stop working or become useless. Apps on the external storage can't run while it is mounted on the PC. This causes knock-on problems when you connect your phone to the PC:. This is because USB mass storage is a low-level protocol giving the PC low-level access to the whole filesystem. 
Newer Android devices don't support USB mass storage because it has a big shortcoming: the phone and the PC can't access the storage at the same time that way.
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