Floppy 3.5 inch (with pins) and 5.25 inch (with an edge connector finger) go as peripheral.
DVRs: all cable/satellite consumer class DVRs will have a peripheral “main board”. The led display board is USUALLY peripheral as well. Button boards and other small secondary boards are usually midgrade. If If the power board is separate it’s midgrade as well.
Prosumer and commercial DVRs will usually have a full fledge motherboard. So anything with an original msrp over a few thousand dollars post a photo to get it classed. Some old Sony, original aftermarket systems, etc can have large socket or even dual socket boards.
They all use standard hard drives.
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