The names commonly used for the partitions containing Windows
startup and operating system files
are for the system and boot partitions, respectively.
The system partition refers to the disk volume containing hardware
specific files needed to boot Windows (NTLDR, BOOT.INI, and so on).
On Intel x86-based machines, it must be a primary partition that has
been marked active. On x86 machines, this is always drive 0, the drive
the system BIOS searches during system boot for the operating system.
The boot partition contains the Windows operating system files
(usually \WINNT) and it support files (usually \WINNT\SYSTEM32). It
can be the same partition as the system partition.