Problems with a 10TB disk in HP Z800

[TAILOR7]

I have installed a 10TB hard drive on my new to me Z800.  Both the bios and Windows 10 only see 2074 GB.  The refurbisher installed the new 10TB drive for me.  The drive was set as MBR in Windows and I changed it to GPT and restarted but nothing changed.  I checked the bios and the SATA Emulation was set to IDE so I changed it to ACHI+RAID but nothing changed.  The Intel RST driver version already installed is 13.2.0.1022.  The most frustrating thing is that I have another Z800 with a 10TB drive and it read all 10TB of the drive instantly upon installing it.   Here is a boot up screenshot of the computer that works properly:

Boot up of Computer1 that works properly

Here is one from the computer that is not working properly (none of the hard drives show up attached to this controller):

Boot up of Computer2 that can't readt the 10TB drive

In this next screen shot, you can see the drive that has 2074 GB capacity is the one that actually has 10TB capacity:

Boot up of Computer2 that can't see 10TB

Could this be the problem?  Any ideas on how to resolve this?  Thanks.

[DGroves]

the z800 is a "legacy" system it's hardware/bios is not able to use large capacity drives

the limit for a boot drive is 2GB, a data drive is 4gb  (although newer 6/10GB drives may work as a data drive)

the controller should allways be set to AHCI/Raid

do you have any "!" or "x" in device manager?

has the correct enterprise RST driver been loaded?

to use a 10gb drive you either need a newer system that uses a UEFI bios which supports GPT format,  or you can try placing the drive in a ext usb 3.0 case and accessing it that way allows the usb case to provide the nessary translation, allowing the z800 to see the full size, however the drive access will be slow due to the usb 2.0 interface

is the new 10GB drive a IBM drive? some drives are not formated for 512 sector size

is the working 10GB drive in a z800? and is it connected to the "SCU" ports or the one of the two blue SATA ports?

[TAILOR7 · Accepted solution]

Problem solved!  Contrary to what has been said, the Z800 is definitely able to use drives greater than 2TB.  I have one Z800 with a 10TB drive in it working perfectly.  In my newly acquired refurbished Z800, both the BIOS and Windows would only see 2TB of the 10TB.  After changing the SATA Emulation to AHCI in the BIOS (it was set to IDE), updating the Intel RST driver, and reinstalling Windows 10, I could still only see 2TB.  Thankfully, I happened upon the "HP Z800 Maintenance and Service Guide" which should be mandatory reading for anyone with a problemed Z800.  Here's the link:

http://jp.ext.hp.com/lib/doc/manual/workstation/hp_workstation/504632_001.pdf

Here's page 70:

The connectors labeled 13 are for SATA drives, the connectors labeled 16 are for SAS drives.  Although all of the drives in my machine are SATA, the refurbisher left them plugged into the SAS connectors.  Page 107 of this document describes how various hard drives should be plugged in.  I unplugged all drives from the SAS connectors and plugged them into the SATA connectors.  Rebooted and my problem was solved.  Although BIOS still only sees the 10TB drive as 1122GB, Windows 10 sees it as the full 10TB.  For my purposes, this problem is solved.