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Storage Spaces has to be supported by WinPE; it's more than just a driver that has to be included. The newest version of WinPE that Reflect currently supports is WinPE 10 1607, which does support accessing Storage Spaces, but I've seen two issues reported here already:
- Someone using Storage Spaces for a data volume on a Windows 10 1709 PC found that Reflect could see it within Windows, but not in Rescue. It's possible that 1709 changed the Storage Spaces setup in a way that wasn't backward-compatible with 1607, and if so, that might be fixed whenever Reflect supports a newer release of WinPE, but that hasn't happened yet and the thread I'm referring to didn't go very far, so that part isn't completely clear.
- Someone else had a new Surface Pro 1TB model where the boot volume is actually 2x 512GB SSDs set up as a Storage Space. They couldn't see that in Rescue either, and the additional wrinkle on that front is that although Microsoft has added support for accessing Storage Spaces in WinPE, they've never provided any tools to create and manage them in that environment, and the reason is that Storage Spaces has never been supported for boot volumes. That seems to have changed with the Surface Pro, but Microsoft never even formally announced that new capability; it just appeared on the new Surface Pro 1TB to everyone's surprise, and in fact they STILL haven't officially confirmed this capability or offered a way for other PCs to use it. The lack of WinPE management tools has already created problems for Surface Pro 1TB customers because some of them deliberately broke the Storage Spaces RAID 0 and found that they couldn't create it again before performing a fresh install, nor could they implement the Storage Spaces configuration after installing Windows. Microsoft has since updated their Surface rebuild tool to address the clean install scenario, but that only helps Surface users. The general purpose tools that Microsoft makes available to everyone else have not gainedthis capability yet. The only standard management tools for Storage Spaces are the full Windows GUI and PowerShell, neither of which are available in WinPE.