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r/homelab · u/Educational___Duck1 ago 2026, 16:35

HP Gen8 Odd Disk Behaviour

All,

Struggling to understand this issue.

For a while my Gen8 has been running with a 2.5" SSD (using a drive caddy) in the left most/slot1 drive bay, which is being used as the Windows OS. In the right most/slot4 I have a 6TB WD Red installed.

Ive come to install another 6TB WD Red in slot 3, and when trying to transfer data to this new disk you can hear an odd spin sound like its trying to get up to speed but cuts out.

If I romve the disk from slot 4, so just have OS disk and the new 6TB everything works fine.

Both 6TB disks pass WD Life Gaurd Extended Test.

The reason for getting the 2x 6TB Reds is i was having this issue with some 6TB Blue WDs and assumed it was because they were kn their way out.

Im now starting to think its something to do with multiple disks being installed.

RAID isnt enabled as the ROM has failed on the motherboard so just using the native IDE/SATA interface.

Anyone had similar?

Thanks

Comentarios

u/sir_WordyCurfew31 ago 2026, 16:47
Sounds like the backplane or power delivery is choking under the load of two spinning drives. Those microservers are notorious for weak 5V rails once you start stacking multiple 3.5" disks, especially if the PSU is the original 150W unit. Try swapping the drive positions, if the problem follows the bay you know it's a slot issue not a disk one.
- u/Educational___Duck11 ago 2026, 17:03
  Thank you for the reply. Yes its the 150W stock PSU. As per the other persons post below, using the Molex/SATA power adapter and on board SATA port everything is working fine!
u/greyline_it11 ago 2026, 16:52
Classic spin-up brown-out. The Gen8 PSU is 150W and 6TB Reds pull close to 2A each on the 12V rail during spin-up — two Reds plus an SSD spinning up together is right at the edge, so the newest drive starves mid spin-up. Hence the spin-cut-spin sound. Passing LifeGuard solo and working with one Red pulled is the tell. Quick way to prove it: power the new Red from an external Molex/SATA adapter with the other two still in the chassis. If it behaves, it's the PSU, not the disks or the backplane. On native SATA you don't get staggered spin-up control, so the realistic fixes are a bigger PSU or running the third drive in an external dock. Saw this exact thing constantly on hosted Gen8s once people stuffed them with 4TB+ drives.
- u/Educational___Duck11 ago 2026, 17:02
  Thanks for the reply I never thought about the current draw of the larger disks. My unit is stock so still has the 150W PSU. Connected using a molex to sata power connectoe, and used the on board sata plug and absolutely no issues. Funny you should mention the 4TB disks. From memory I originally had 2x 2TBs Blue in and never had an issue. Then jumped to 3TBs and starting running into issues. Then obviously as I've jumped to 6TB the problem became worse. I just figured I had ordered some HDDs which had been a bad batch or had no care when being delivered. But it appears it was the PSU all along. Do you have a recommendation for a more powerful PSU?