Windows 8 x64 doesn't show correct RAID size with Asus P8Z77-V LK

terralysis · January 31, 2015, 7:01am

Hi folks,

I have an Asus P8Z77-V LK and I am trying to setup a RAID 1 array with 2x WD Red 3TB drives. I switched the SATA mode from AHCI to RAID in the bios successfully. I hit Ctrl+I to enter the Intel RST Option ROM v11.0.0.1339 and setup the RAID 1 array. The correct RAID size of 2.7 TB is shown in the Intel RST Option ROM, however, once I get into Win8 - under disk management - the drives show ~746 GB each and are not RAIDed together.

Does anyone know how to fix this problem?

Fernando · January 31, 2015, 10:29am

What do you see, when you run the Windows Explorer and right click onto the related drive and choose the "Properties" option?

terralysis · January 31, 2015, 4:57pm

In disk management, both drives are currently unallocated space so they don’t show up in windows explorer.

Fernando · January 31, 2015, 5:23pm

This means, that you have just created the RAID1 array, but nothing else (no partitioning, no formatting of the partitions, no dedication of drive letters).
Question: Which boot system (LEGACY or UEFI) did you use, when you installed the OS?

terralysis · January 31, 2015, 8:14pm

it’s a UEFI bios - I used the advanced mode so I’d have access to more options.

Fernando · January 31, 2015, 9:40pm

This was not my question. I asked, if you installed the OS in UEFI mode (creating a GUID Partition Table) or in LEGACY mode (using the Master Boot Record).

terralysis · January 31, 2015, 10:57pm

Sorry, misunderstood your question - The OS was installed on a 120gb SSD through the Win 8 setup, so I assume it was created using MBR.

Fernando · January 31, 2015, 11:15pm

Only the GUID Partition Table supports >2 TB sized drives. So you should convert the Partition Table from MBR to the GPT.

terralysis · January 31, 2015, 11:44pm

Thanks for your help so far. How do I do that?

On a side note: My older computer also has Win8 installed on a 120gb SSD and a 2x 4TB WD Red RAID 1 array. The OS was installed the same way (so I assume MBR, anyway to confirm this?) and the size of the 4TB drives is read correctly.

Fernando · February 1, 2015, 12:09am

Look >here< or >here<.
Since your questions have nothing to do with the topics of this Forum, you should better ask them somewhere else.

terralysis · February 1, 2015, 1:08am

The 2 drives are already GPT disks. Following the instructions shown in your first link, the only options available to me are ‘Convert to Dynamic Disk’ and ‘Convert to MBR disk’.

Any ideas? Would this not pertain to the RST drivers?

Edit: I managed to fix it. I downloaded the Intel RST(e) AHCI/RAID Drivers & Software Set v13.5.0.1056 WHQL from this forum and installed it. After the restart, Disk management shows 1 entry ~2.8TB in size and when I go ‘properties’, the title shows ‘Intel RAID 1 Array’. I’m assuming the hardware RAID worked then?