DVR Backup. How to access videos from PC or Mac ?

Hi,

I own a WatchNet ES-12004RTS DVR : http://watchnetinc.com/es-12004rts.asp

I performed a Backup of 2 channels successfully on a brand new external USB drive (WD Passport Ultra 2TB) as per the instructions in the User Manual page 49 section 4.7.1.

http://watchnetinc.com/downloads/manuals/EMB/EMB_User_Manual_5.6_02162010.pdf

Side NOTE : Before the backup the DVR requested to perform a Format of the external drive since the drive format wasn't recognized. After performing the formating, the external drive was recognized by the DVR and I was able to perform the backups.

I then tried to consult the external USB drive saved videos using two different Laptops (windows 10, and Mac OSX 10.11.6) .

In both cases the external USB format is not recognisable by either Windows or OSX.

What is required to preview the saved videos once saved on the external USB from a laptop (Either Windows or OSX) ?

Thanks