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I've used a mobile phone with 16 GB internal storage where 4.81 GB used by OS and 10.72 GB out of remaining 11.19 GB. But when I calculate the total storage used by other features, only 8 GB (approx.) is found. Where are more than 2 GB memory used?

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  • The storage plus os seems to add up to approx your indicated storage. Actual storage is less than realized storage due to file system needs , also called overhead.
    – mongo
    Commented Sep 17, 2017 at 17:24
  • @mongo Wasn't overhead the time required to open, load to memory, flush to storage and close files?
    – Grimoire
    Commented Sep 17, 2017 at 17:46
  • File system overhead, storage or other consideration required by a file system that is not directly related to data. From overhead wiki.
    – mongo
    Commented Sep 17, 2017 at 19:32

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That space taken up when you drives are formated..it does not show the full 16 gb . What it does is partitions the 16 GB into 2 drives than it formats both...just like a PC. These are files used to make the hardware work with the software..sort of like a middle man so to speak.

For example : based on your operating system , a 16Gb drive will only read 14-15Gb after being formated.

Another example: stick an empty 16Gb SD card in and than check the free space...it won't read 16GB. Please note: you can use any size SD card...just make sure it's formated (empty)

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