How to see a hidden partition on a memory card under android?

Question

Android

Subini DVR-HD219 recorder is available .
He very cunningly cuts the flash drive in such a way that only 500MB is visible in the explorer, and makes all the entries on a hidden partition (at the same time, if you look at the memory card through the Windows Disk Manager , then there is only one 7.4GB partition).
Only the DX2Player.exe utility for Windows is openly available , which allows you to view videos and export them to your folders.
I would like to have access to videos on the road from an android tablet , but, accordingly, he also does not see the hidden section.
How can I watch it under android or is it unrealistic? Will have to change the DVR then.

Answer 1

The registrar must be changed to a model from a more adequate manufacturer.
Thanks everyone and +1! :)

Answer 2

Root explorer, in theory, should see any partitions if they are somehow used by the system.

Answer 3

What does sudo mount say?
Try installing Link2SD .

Answer 4

First look at the card from the computer through any disk editor to find out exactly how many partitions are on it and what file systems are on them. Windows disk management should not lie about the number of partitions, but it will show only (ex)FAT and NTFS about the types of file systems.
A bootable distribution like GParted live, parted magic, etc., or a trial version of any disk editor for Windows should suffice.
Further actions will depend entirely on this.