Why does my ProConnect hard drive show 10% of Free Space

AvertX ProConnect NVRs have various hard drive configurations offering different storage capacities.  10% of each drive is listed as Free Space by design. 

Within the Storage tab (Setup > System Settings > Settings > ) the default hard drive configuration of your system has 90% allotted.  By design, 90% of each drive is auto-dedicated and set aside to secure video data folders.

The size of the remaining 10% listed as Free Space should not to be increased or decreased.  10% of each drive is designated for processing purposes. For instance, this space is used when an update is downloaded or while updates are being executed.