It's still a separate factory making separate drives. This line even uses a different storage controller. But this is also true for luxury ranges, in general, so you may be asking for too fine of a distinction. (Their usual luxury range is the WD Red, however.)
The hardware isn't identical. Hetzner is known for having more drive failures than is typical as a result of replacing failing drives with "refurbished" ones.
Most enterprise drives come off the exact same production line too.. Some have a different external interface but the important parts are all nearly the same, they might test them differently
This comes across as a pet peeve. If the drives are branded, marketed, and sold as HGST, then they are HGST drives. Even if Yev is wrong, it's possible that WD or Toshiba are maintaining HGST drives to different specifications or QA standards.
Not extremely unlikely if they were identical drives from the same manufacturing batch. It's good practise to use diverse manufacturers or at least batches when adding disks to a raid array for just this reason.
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