Samsung SSD Evo 850 250gb not showing up in Windows when motherboard bios is set to Raid

[NigelJHatcher]

Currently have 4x Corsair F40 "40gb" drives in raid 0, I purchased 6x Samsung EVO 850's to replace them, however ran into a problem during windows 7 64bit install, The bios finds the drives fine. I can setup the raid 0 fine and it shows up as functional. Run Windows 7 install, Installed latest AMD Ahci raid drivers, could not find the drives no matter what drivers i used. Swapped board back to ahci mode to see if windows could see them, which it did. so i put my F40's back in back in raid mode booted up windows. and put just 1 samsung ssd in along side the 4 F40's and windows again could not see the single samsung because its in raid mode on the bios even though its setup as a stand alone disk, I even took the samsung out formatted it put it back in with the f40's still wont show up, So as long as my board is set to raid this samsung 850 wont show up in windows 7. Ahci mode works fine. Any thoughts on what is causing this?


Motherboard: MSI 790FX-GD70 Bios version 1.17 (latest)

 

[tridem]

Did you find any solution? I've exactly the same problem, same ssd disc but with a motherboard MSI 970A-G43. My system is new, it seems yours worked before replacing the disks... do you think is likely related to the Samsung SSDs rather than the mobo/drivers?

 

[x86inc]

using another system to allocate a partition to the full size of the drive then try the install again

 

[SuperTech-IT_com]

Some drives simply aren't compatible with on-board (AMI for example) RAID controllers.
I had a 2 drive RAID on my system, and wanted to expand it to 4.
The original 2 drives were inexpensive LITEON 256GB drives. Actually one is 240GB, the other is 256GB.
I had these in RAID 0, and it worked like a charm and greatly increased the speed - something many claim won't happen with an SSD.
So I thought if 2 was good, 4 would be better.
I got 2 Samsung 850 EVO drives.
I backed up the RAID, reclaimed the drives and set the new raid for all 4 drives.
I couldn't get this to work. At all. Windows would simply never see them.
So I tried making a RAID with just the Samsung drives.
Windows installer after loading the RAID driver would only see the LITEON single drives, not the Samsungs in RAID.
Finally I put just the LITEON drives in RAID 0, and left the Samsungs as single drives.
Windows installer only saw the RAID drives, and didn't see the Samsungs at all.
I repeated this process swapping the SATA cables from Liteon to Samsung.
Same results.
Conclusion, some drives simply aren't compatible with AMI RAID.
In SATA non-RAID mode, the drives worked fine.