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Why can't it simply link to extSdCard?

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  1. If it would use the only partition of your SDCard, apps would become unavailable if that card is mounted to e.g. your PC via UMS (USB mass storage). That's what happens with App2SD, and Link2SD wants to avoid that.
  2. Ever tried creating links on FAT (which is the used on your card). This adds to the problem.
  3. Using a separate partition, Link2SD can make use of "advanced" types, e.g. ext3/ext4, which leads (amongst other things) to better performance. Doing so with your only SDCard partition, this would introduce problems for Windows users, as Windows doesn't support EXT file systems out-of-the-box

These are the most obvious reasons for this decision. It might very well be I missed some more -- but these alone are enough to make it a wise decision :)

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  • Weird, on my device (Samsung S3 Mini) partition is not unmounted when connected to PC. In fact I'm using FolderMount with my extSdCard and it's working perfectly fine...
    – zduny
    Jun 12, 2013 at 15:15
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    Your device probably doesn't use UMS but MTP. With UMS, storage is granted exclusively (hence it becomes unavailable on the device, and can be accessed on block-level if needed), while with MTP it is shared (and hence available on both ends, but no block-level access is possible from the PC). See the usb-mass-storage tag-wiki for details.
    – Izzy ♦
    Jun 12, 2013 at 15:42

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