KISS. If your goal is to watch movies on a TV, get a TV that can play videos. For at least 5 years now all(?) the Samsung tv's have been able to play .MP4 files and some other formats. Just
plug in a USB device with the movies and fiddle with the
remote control. Memo, Samsung also makes some buggy TV's. (Big argument about why so many of them are refusing to turn off, you turn them off, they turn back on. Samsung says buy a $200 replacement board.) And the free
route to converting discs to MP4 and other formats (handbrake, etc.) can also be incredibly slower and buggy compared to some of the
commercial conversion apps. All the other approaches and options are nice--but they ain't KISS. Anything that can play videos from a USB device directly, will also give you all the other options for
Wifi and other connections. Some have better support for DNLA or
WiFi but anything that fits the USB port will
work around that. Flash drives up to 256GB are easy to find, as are SSDs. An "external" SSD won't care about the
boat bouncing, will plug right into the USB port. And those 2TB miracle sticks on eBay? Are probably the same sellers who finally got thrown off Amazon for the same scam. Stick to a brand name for the media, and the vendor. (As if that's news.)