Mixing RAID & non RAID, Windows7 will not see Drive

February 14, 2012 at 05:48:49
Specs: Windows 7 64, i72600k/16GB
Hi tech folks,

I have a RAID 1 setup on my Asus P8P67 Pro mobo with a pair of SATA III WD drives (in Win7 64bit).

I started to run out of HDD space and so simply wanted to add another (SATA II) drive for data
in non RAID mode.

I hooked up the new drive but, although the CTRL+i facility saw it as a RAID 'non member'
- of zero bites - windows could not see it, so I could not format etc.

The manual says if RAID is enabled then all channels are RAID and if you un-RAID, all data will be lost, so I have been reluctant to mess with the drive in AHCI mode. But I also hear you can have a single non RAID drive in this existing RAID setup - just don't include it - but how?

I tried a different approach and enabled Marvel (as AHCI) thinking that this might solve the problem. Windows 7 installed the Marvel drivers and told me that the drive was ready to use, but still it was not showing up, so I disabled it.

My query is how to get this drive in ANY mode to be recognised in the OS?

There must be something obvious that I am missing (otherwise I have a duff drive?)

I'm guessing knowledge of this mobo is significant here, rather than WIn7?

Thanks in advance

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February 14, 2012 at 06:33:13
Why do you feel you need RAID at all & how big are the drives you're working with?

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February 14, 2012 at 07:21:05
Well, in hindsight, I may come to feel that RAID might have been a mistake - I don't know - I wanted some security on an unknown overclocked setup - but that hardly addresses my original question though, does it. The drives are all 1TB.


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February 14, 2012 at 10:49:12
RAID just unnecessarily complicates things. Speaking of which, why didn't you put your RAID drives on separate controllers for better performance?

"Windows 7 installed the Marvel drivers and told me that the drive was ready to use, but still it was not showing up, so I disabled it"

Did you partition & format the drive? Windows won't see it until you do.

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February 14, 2012 at 11:31:47
Format!! Well, THAT could be the very obvious thing I haven't done - Because I don't want to break the RAID array in case I lose all data (as it warns - and I don't even know if just changing the SATA configuration in BIOS away from RAID will effectively break the array - or whether Ctlr+i is where that mistake happens)....I haven't dared fiddle and have been unable to check the disk on its own at all on any channel. I don't know what status it is in but I hoped I could use the WD tool from in Windows, but that wasn't seeing it either.


I'm relatively new to this RAID and SATA lark and it's just been making me very wary.
Anyway, I bit the bullet and reactivated Marvell (I don't know if this is the best route)
and tried using Disk Management - and this time was met with a 'please initialise
drive' message. However, it failed due to an "device i/o error". I tried my WD tool and what freaks me here is that it shows an IDE (disk1) drive of 3913987GB "not available" - sometimes it is 0GB and not available.
I don't have any IDE controllers so I am a bit cautious of this discrepancy. However, it also shows a zero byte IDE drive2 "not available". (Surely these should read disk 0 & 1 not 1&2?)

On the non Marvel setup, Windows still refuses to see it at all But the RAID screen sees it as non RAID.

So, all in all, it is a bit daunting and problematic to do anything without further
exploration. I was expecting to hook up and go.


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February 19, 2012 at 05:49:18
Ha, Well for anyone who is remotely interested...

I took the drive it to be checked locally and they said there was nothing wrong with it. They got this ok message JUST like I had got when I used only the disk tool.
So I said ok, format it for me then. After which they said it couldn't be done as there was some disk access problem and it had randomly stopped spinning.

I guess this proves it was duff all along. So no replies could have helped.

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