Use EVMS as filesystem manager
From ReactOS
EVMS is a tool to manage LVM and RAID systems.
EVMS is a great tool to manage logical filesystem volumes. With EVMS, you can change partition sizes, mirror (for backup) dinamically reallocate bad-blocks, and do all sorts of nifty stuff, without annoying reboots. Under linux, with evms you can manage logical volumes and RAIDs.
It would be nice to make ReactOS use EVMS by default, as it is as hard to use as Windows' diskmgmt tool for 'mmc.exe' if all you want to do is a simple filesystem. With just a bit of more knowledge, or a nice wizard, the user can create and use it without even knowing what EVMS stands for. Along with EVMS, Software RAID would come in too, as it is one of the nice things managed by EVMS.
Some porting would be needed. I wonder if trying to make something which can be loaded during the 'press key to load 3rd party drivers' stage can be used to test in Windows installations?

