RE: 2nd drive install issues with Dell 9550 (p56f001)
@ejn64, RAID mode makes it possible for Intel Smart Response to be enabled, but it wouldn't prevent the 2.5" drive from being shown. That wouldn't even make sense given that in the Smart Response case, the "primary" drive would be the 2.5" drive in the first place. But actually even when Smart Response is being used, the 2.5" and cache module are still presented in Disk Management as separate devices, not as a single virtual disk. At least that's how it was on the last Smart Response system I saw. But again, the system being in RAID mode would absolutely not explain a 2.5" drive being hidden.