Re: Still haven't separated OS and Data
redirected special folders have been around since at least XP, maybe even 2000.
NTFS partitions can be mounted in folders in the same way you can on linux.
Windows 7 introduced (to windows) the idea of libraries, where you can group several folders together so you could have your documents folder spread across several disks but all accessed together.
The problem is most people don't have a clue about this stuff or why it's useful. I recommend to most people they just have one big partition and just take decent backups. I see a lot of laptops where the OEM has split the disk into two partitions for OS and data but the owner doesn't understand that so they have a full C drive and an empty D. Since keeping your data on a separate partition doesn't remove the need for backups and most people don't regularly reinstall their OS, I think most people are better off with a single partition.