Only the original OLED S3s will work with generic exteranal drives at all. The THD and all S4 units will ONLY work with the Western Digital tivo expander drive.
I can tell you that no tivo can handle any drive over 2.2 TB due to limitations of its operating system. There were some threads back when the S3 models were newer discussing various drives but that was long ago and most of those drives are no longer available. For the most part, the enclosure other than supporting eSata and proper cooling for continuous use was unimportant. It was the drive and its configuration that mattered.
Current : Roamio Base with 2TB drive and 2 Premieres and a mini. OTA. kmttg, pyTivo, running with a 78TB Synology 1511 NAS....serving up the world.
Setup help for pytivo under windows:
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