Lenovo G530 User Manual page 6

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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.
II. A portion of the hard disk space is used for specific purposes
Lenovo computers come with preinstalled Lenovo Care, so the hard disk
has a special portion partitioned before delivery, which is used to store
hard disk mirror and Lenovo Care 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.