If you reinstall the operating system you are going to have to reinstall 99.9% of applications anyway, because their installation requires registry and necessary-on-C changes that must integrate properly. 'This way you can reinstall the operating system and everything is still there' - 90% bunk. Absolute, complete, testable, objective bunk. It is actually slower as it physically requires more head movement. 'It runs faster partitioned because it is two disks' - 100% bunk, the most bunk-full statement, since a partition is a pretend second drive. Over decades of managing departments with system admins who want to do this here are some rationales and why they are wrong-headed: Note this is not about partitions like recovery or boot partitions, talking about the drive being both C and D or similar. Probably always was bunk, but is definitely bunk today. In my opinion every justification I have seen for this is bunk. It holds on in some system admins' processes, and you see it recommended widely. The idea of partitioning the main, or single drive, of a computer is one that started long, long ago. This is a philosophical statement in the FWIW department.

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