I don't know the specifics of the home theatre hardware, but there are two likely factors at play here:
- formatting
- size
Hard drives have physical differences beyond 2tb, and again past 4/5/6tb (varies by manufacturer). Computers have to interact with these differences -- by way of drivers, and other hardware tricks within an enclosure (if external).
The other issue is formatting: NTFS, FAT32, exFAT, HFS+, Ext4 -- etc, etc, and many more. The drive likely came formatted as exFAT or NTFS, and you need to reformat it for the other one. HFS+ is just for Macs, and a "Mac" version drives are preformatted for it (but can be reformatted with zero issues for any other OS or file system). See what the "working" drive is formatted as.
Your job is now to look in the home theatre instruction manuals, and find what is allowed and/or required.
You seem to know some of this, but something is still amiss.
There is also a slight chance that the MPEG files need a specific flag/marker on them, to notify the setup that it's one of it's own files. Again, I'm not sure what sort of home theatre hardware this is. It's not likely, but certainly not impossible. MPEG is a wide spec, especially for transport streams (TS).
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