Windows default filesystem is NTFS and it's pretty safe to write. I certainly wouldn't set up something like a server which relies on this, but for personal use or even a development workstation I think it's fine.

I guess it might be a good idea to first check the disk using Windows after something like a power loss while the NTFS partition is mounted. But apparently NTFS-3G (one of the NTFS drivers) can also use the journal to recover the filesystem after a power loss.