Geneos - How does the Disk Plugin calculate totalSpace of the partition in Linux?

The value of totalSpace of disk shown in Disk sampler is based on the total value of "Used" & "Available" columns and not from "1K-blocks" as it might be expected. 

df command output: 

In this example, we are looking at the /boot partition on a Linux machine.

i.e. ( 308772 + 729564) / 1024 is approximately 1014Mb.

Disk sampler dataview:

Please also note that the total value of "Used" & "Available" columns might not be equivalent with "1K-blocks"  column due to blocks that are reserved for root.