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Does anyone know what's going on with those U.2 NVMe hard disk drives? (see https://blog.seagate.com/enterprises/seagate-unveils-worlds-...)

I'm asking coz the OP mentioned the need for a PCIe-to-SATA bridge chip to have more than a couple of SATA ports. I'd assume that if HDD were also NVMe devices, it will be simpler to just wire each PCIe lane to a drive, without requiring any bridges. A PCIe 2.0 x1 lane is 500MB/s, on par with SATA III 6Gbps.

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These are formfactors that come from the datacenter industry and probably will become very widespread over the next years.

The ServeTheHome Youtube channel had a good overview video about those drives around 2 years ago: https://www.youtube.com/watch?v=29Nh3p6779E

Thanks but the STH video you linked is talking about new "ruler" form factors for SSDs and accelerator cards. I was wondering if anyone actually used the 3.5" HDD with U.2/NVMe connector.

> probably will become very widespread over the next years

Doubt. SATA and SAS is more than enough, cheap (not for the customer) and has 20+ years of experience. What we would see is a clear distinction between 3.5 HDD and whatver SSD storage boxes.

Consumers? 2.5 and M.2 for SSD, 3.5 for HDD. For years.

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