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HP z420 Cannot get more 2 HDs recognized by the OS

The entire rundown of my issue can be found here ( https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/z420-Raid-config-and-more-than-HDs-plugged-in-issues/m-p/6305402/highlight/false#M18295 ) but I'll hit the high points here-

HP z420 Desktop
Windows 10
2x 128 GB SSDs
2x 1 TG normal SATA drives
All HDs have been scanned, no bad sectors
All HDs have been formatted NTFS
The machine was set run in RAID then I changed my mind and broke the RAID
The BIOS on the machine was reset to factory defaults
The BIOS was updated to the current version
I cannot get more than 2 HDs to get recognized by the OS at any time
Those HDs must be in the first 2 SATA slots
When all 4 drives are plugged in, the 2 HDs recognized show up in the BIOS.
The 2 HDs that aren't recognized show up in Intel Storage Manager

Any help is appreciated.

William Miller

Sounds like the drive controller for the Intel ports is not properly communicating with the BIOS controlled SATA ports. What is the intel controller set to? AHCI, RAID, etc?

ASKER CERTIFIED SOLUTION

Adam Brown

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travisryan

ASKER

William, I've set the drives to AHCI + RAID, and plain AHCI, doesn't matter.

Adam, I tried to install that software the message I got was "The computer currently contains driver versions newer than the versions you are about to install". After I moment I figured I had nothing left to lose so I updated, it found the drives immediately. Good suggestion!

travisryan

ASKER

Updating the drivers did it.