Lenovo 06472AU User Manual page 168

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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