Sharing a DB 7020 HDD with a DB 500


Newbie to the Dream
My Satellite Setup
3 LNB 80CM Dish, (Hotbird, Astra 1 & 2) DM800, DM7020S & DM500S, PLi® Beta
My Location
I have a DB 7020 and a DB 500 on a Home Network and would like to have access to the HDD in the 7020 by the DB 500. The intent is to watch recorded shows saved on the 7020 from the TV where the 500 is located and also record a program from the 500 to the 7020 HDD while watching another program on the 7020.

I’ve looked around and can’t seem to find any info that covers this situation, plenty of info for a Windows HDD setup but nothing for this type of setup.

Can anyone provide a step by step procedure to mount the 7020 HDD in the 500 or point me to an idiot guide for this setup? Thanks