Is it possible in Android create virtual (in memory) SD card?
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No. At least not on today’s phones, which don’t really have enough ram to do this.
Also you’d need root or a modified platform in order to create a ramdisk and point the things that should point to the sdcard there instead.
But if you had root, and the ram, the capability is there from the underlying linux (and even already used by android to make small ramdisks for other purposes), you’d just need to set it up right. This might apply on some non-phone device with more memory than it needs for ordinary operation.