I am running android oreo 8.1 (custom ROM) on Xiaomi Redmi Note 3 Pro. I have a 64GB memory card in which I want to store large files of size 15GB, 20GB etc. So I can't use FAT32 filesystem. I formatted it to exFAT but battery started draining faster as mount.exfat process uses CPU above 20-30% during read/write operation.

If I format to ext4, How can I made sdcard files available to all android apps ? Is there any other filesystem which can store large files and android apps can access it as well ?

  • extX filesystems are in general not supported for external storage, only Fat/exFat. Perhaps you should be looking at using your card as adopted storage, but you did not give any details as to your device make/model. – acejavelin Apr 8 '18 at 14:06
  • I don't want to use it as adopted storage. – jonny789 Apr 8 '18 at 14:39
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    ExFat would be the preferred method here, if it is causing battery drain there is a problem with ROM, you should go to your maintainer and report the problem through the ROM's appropriate channels. A card's type of file system should have negligible effect on battery life. – acejavelin Apr 8 '18 at 14:40

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