I’m using in this unit 8 HDDs, only 2 have a problem, these are WD-WCC7K7LL9KZK, these are the only WCC7 models of the 8, both became unseen after the firmware update. It seems to me I have the following challenge:
On TVS-871, QTS 5.2.8 introduced:
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Faster SATA link-timeout
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More aggressive power-state enforcement
Older WD Reds:
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Spin up slower
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Respond later to IDENTIFY after reset
Result:
QTS decides the bay is “empty” → Not inserted
Linux often still sees the disk — QTS just refuses to attach it.
I went back to 5.2.7 and the issue was resolved, please look into this!