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Another RST problem

post #1 of 5
Thread Starter 
Hi guys, I hope someone can help me with this.

I'm running a Gigabyte GA-Z77-DS3H board, with a Samsung 840 Pro as the system drive, an old 2TB Western Digital as a secondary drive, and a 64GB Crucial M4 mSATA drive which I hoped to configure to use Intel's Rapid Storage Technology. The OS is Windows 8 Pro (64-bit).

In my BIOS, the ATA mode is set to AHCI, and Rapid Storage Technology is turned on. I've installed the Intel RST software (downloaded from Gigabyte), but although all the drives are listed, none of them can be accelerated.

What am I doing wrong?
post #2 of 5
Quote:
Originally Posted by markbarnes View Post

Hi guys, I hope someone can help me with this.

I'm running a Gigabyte GA-Z77-DS3H board, with a Samsung 840 Pro as the system drive, an old 2TB Western Digital as a secondary drive, and a 64GB Crucial M4 mSATA drive which I hoped to configure to use Intel's Rapid Storage Technology. The OS is Windows 8 Pro (64-bit).

In my BIOS, the ATA mode is set to AHCI, and Rapid Storage Technology is turned on. I've installed the Intel RST software (downloaded from Gigabyte), but although all the drives are listed, none of them can be accelerated.

What am I doing wrong?

Another RST problem? Sigh... rolleyes.gif

I see your problem immediately, you're in AHCI mode. An accelerated or "caching" SSD system works by creating a variation of a RAID 0 volume. Which means you must have the SATA mode set to RAID before you can accelerate a HDD.

But since you have installed Windows in AHCI mode, you just can't change to RAID mode, since the PC won't boot if you do. You'll need to perform a registry update and restart to enable RAID mode, or install Windows again in RAID mode.

For more information on changing to RAID mode, click on the Storage Essentials link at the top of the SSD forum page, and find Sean's guide about SSDs, there is information about changing to RAID mode and SSD caching.

The IRST UI has a Help button, if you click that a new window opens with all kinds of documentation about using RST.
post #3 of 5
Thread Starter 
parsec,

Thanks so much for replying. I read the thread, and then chose How to: Change SATA Modes After Windows 7 Installation, and followed the instructions in the Windows 8 section.

The 'name' value was already set to 0 in HKLM\SYSTEM\CurrentControlSet\Services\storahci, and I have no key called HKLM\SYSTEM\CurrentControlSet\Services\storAHCI.sys\StartOverride



When I tried to switch to RAID mode, regardless of this setting, I got a BSOD.
post #4 of 5
Oh great, the Windows 8 section is not complete, if you check that entry in the guide it is: Change to AHCI mode from IDE mode:, which is not what you need to do.

Not to worry, you have the IRST driver installed now, correct? The main difference between Windows 7 and 8 is the Windows AHCI driver was changed to storahci from msahci. But you are not using storahci, so you should not need to deal with it.

In the guide, open up the Change to RAID mode from AHCI mode or IDE mode: for Windows 7. Not to worry, it will be the same.

You'll be looking for these keys, which is described in the guide:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\msahci
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\iaStorV
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\iaStor

You really only need to change the iaStor and iaStorV entries from 3 to 0.

Read the instructions closely, you make the change, restart and go into the BIOS, then change to RAID, then save and exit, which will reboot the PC, which may then request another restart, which is fine.

If you have problems, let us know.

One other question, you were planning to cache the HDD with the M4 mSATA SSD, correct?
post #5 of 5
Thread Starter 
parsec,

Thank you for your patience. I opened up the guide to that section. I don't have an entry for msahci or iaStor. I do have an entry for iaStorV, but Start was already set to 0 there. I also have an entry for iaStorA, but start was already 0 there, too. I noticed that iaStorV has a subkey labelled StartOverride, and that also has an entry for '0' which is set to 3. I'm going to try and change that to zero on the basis of this advice.

And yes, I'm planning to cache the HDD with the M4 (although I'll probably partition it and put the swap file on it too). I've been pleased with the Samsung 840 Pro, but I can't fit everything on it, and I often hear the HDD thrashing around and causing a slowdown. I'm hoping that the cache will reduce that happening.

Edited to add: Deleting the StartOverride key did it. Thanks for holding my hand on this one - I appreciate it!
Edited by markbarnes - 6/27/13 at 12:51am
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