Why is Used + Available disk space always less than Total disk space?

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QUESTION :

root@localhost:~ $ df /dev/sdb1
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sdb1            1922858352  23247088 1801935664   2% /mnt/external/sdb1

used+available = 1825182752

Size – 1825182752 = 97675600

ANSWER :

97675600 / 1825182752 = 5% this is the default reserved space for root user.

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