My HP Z840 is experiencing an intermittent hard drive drop-out.
I am running a simple array of drives (no RAID), 3 x 4TB HDDs (WD RE2 and Gold), 2 x Intel 750 PCIe NVMe SSDs and a Samsung SSD in a 3.5 adapter bay. 1125w PSU.
Only one drive is dropping out, assigned J:. It will disappear, causing errors, and then come back. Occasionally Windows says it 'needs to be formatted'. This is not the case and it picks up fine.
I had one 4tb WD drive there, so upon thinking it was a problem with the drive, replaced it immediately.
However, the problem is still there with the new drive, which suggests a fault elsewhere.
Further to this, I reassigned all drives to a new hard drive controller (from the SAS system, to new ports which are SATA). This made no difference. So it's unlikely to be the drive, or the controller.
What else could it be? Cables? Anything else?
I think the Z840 has built in cables, is it possible to replace them?