Lenovo IdeaPad S10e 4187 User Manual page 164

If a portion of the hard disk space has been used for some specific purpose, then
the capacity indicated by the operating system will be even less than X × 0.931 G.
2. A portion of the hard disk space is used for specific purposes
Lenovo computers come with preinstalled Product Recovery Program, so the hard
disk has a special portion partitioned before delivery, which is used to store hard
disk mirror and Product Recovery Program program files. The size of the reserved
space for this partition varies according to the model, operating system and
software of the computer. For the sake of safety, this partition is not evident,
which is commonly referred to as a "hidden partition".
In addition, after the hard disk is partitioned or formatted, the system will assign
a certain amount of hard disk space for the system files.
For the above reasons, the available hard disk space indicated by the operating
system is always less than the computer's nominal hard disk capacity.
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S9e and S10e User Guide