Rasplex install SD 249mb partition ?

Sorry if its been covered before but can somebody point me to an explanation as to why the rasplex installer formats for example a 32GB sd card to 249mb ? In windows thats the only partition i can see.

We just use around 1GB of your SD card (split into two partitions). The reason for this is very simple: We don’t need more space.

Is the second partition invisible to windows OS ? As i only see the one.

Is the second partition invisible to windows OS ? As i only see the one.

It's a ext4 partition (linux) and is not readable/writable using windows (at least without additional tools).