Help with 780 not seeing Seagate 4tb drives

So now I find that two of the four 780's will see the full 4TB (3.8tb) and the other two only see around 1.6TB. All have been updated with the identical drivers that the Dell site told me to install.

Looking at the side panel sticker, the large white one, for one that sees the full drive and one that does not... they are identical. I assume the same generation.

Suggestions, please. This has really got me in a bind.

With Windows 7 or better, the 780 should be able to fully utilize large drives for data, provided they're partitioned as GPT.

Which operating system is being used?

Thanks. Windows 7 pro 64 bit. Yes on the GPT.

So, here is what I now know. The two 780's that can "see" the full 4TB have an extra drivers that the other two 780 machines does not.

Intel ICH10 Family 6 port sata ahci controller - 3A02  Version 7.0.0.1013

Not listed on the Intel site... not listed on the Dell site (that I can find) and all these other sites I'm afraid to muck with. All want to install a program to analyze my system. I know what I need.

Can anyone provide a clean driver?

Thanks

Have what is in your top line, yes.

What I think I need is this driver:

Intel IHC10 Family 6 port ahci - 3A02, Version 7.0.0.1013

The two machines that are working have this, the other two do not.

Not on this site that I can find. Not on the intel site. The other sites I'm leery of messing with.

Can anyone provide a clean download, please?

Yes, Windows 7 and yes GPT.

I need to locate this driver. The working machines have it and the others do not.

Intel ICH10 Family 6 port ahci - 3Ao2, version 7.0.0.1013

Can anyone supply a clean download? Not on Intel and not here as far as I can find.

Do you have an older or a newer version of the driver?

I use Intel's download site, and that has always worked. None of my Dell collection has issues with greater-than-2tb drives, even the older ones (like the Dimension 3100, OptiPlex GX620 and OptiPlex 320).

A third-party SATA card can be a last resort, but should not be necessary. I had a 3tb Hitachi working with a Dimension 2350, an old desktop that does not even have native SATA support.

After 5 long days of this *** I just found the problem.

In the Bios under Disks there are four options:

Raid Autodetec ACHI is the one that has to be selected. Two of mine we set to Raid.

Checking the two working comps and they had already been set to Raid Autodetec ACHI and they had no issues with 4TB.

When I did this I got the same additional SATA ports under Device Manager /  ATA as on the working comps. AND that driver was showing up there.

So in my system all the time. Just needed to be activated.

The issue is not a driver its 32 bit or 64 bit os and GPT vs MBR partitions.  Systems without UEFI bios must use a Host Bus Adapter (HBA) and be 64 bit version in order to BOOT from a GPT drive. The machine in the video below is a 780 Tower.

INTEL RST in Raid mode does not support greater than 2TB.

Single Drives require 10.1+ version of INTEL RST.

http://www.intel.com/p/en_US/support/highlights/sftwr-prod/imsm

Thats why western digital had a Rocket 620-OEM controller bundled with their 3TB and larger Drives.

http://www.newegg.com/Product/Product.aspx?Item=N82E16816115072

http://www.seagate.com/support/downloads/beyond-2tb/

http://www.highpoint-tech.com/PDF/RR600/HighPoint%20Product%20Support%20and%20Warranty%20Announcement%20for%20Rocket%20620-OEM%20SATA%20Host%20Bus%20Adapter.pdf

Two of my 780's have the driver and two do not. The two that do not will not see the full 4TB of the external SATA drive.

So, the issue has to be this missing driver... which so far I cannot locate. If I type this in at the intel download site it says it has no such downloads.

Running out of time. Need to get these drives formatted and working so if anyone can provide a working link to this driver i will be most grateful.

ATA means that you were not using the AHCI INTEL RST Driver.

The Same Limitations however still Apply for BOOT drives.

GPT Requires UEFI Bios.

Sorry, not getting what you mean.

These were not boot "C" drives, they were running off the external SATA port at the back of the 780 as external drives.

All I can say is, when I changed the BIOS it worked.

>Raid Autodetec ACHI is the one that has to be selected.

I tried that setting.  Windows 10 would not start with that as the setting, so no idea if it can then see the drive as 4 TB instead of 1.6 TB.

I have an Optiplex 780 with Windows upgraded to Win10.  I have a 4TB Hitachi internal drive in one of those housings that turn it into an external drive.  First it showed as having 2 partitions for a total size of 2TB.  I deleted them and set the drive to GPT format.  I tried the free Aomei Partition Assistant program to re-size my drive as suggested elsewhere, but doesn't work.

Thanks,:emotion-2: that did it.