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have multiple installations of each (as long as each is on a separate
partition) if you're so inclined. But before you add Windows 2000
to your Windows NT system, you must be aware of two gotchas:
• If you're using NTFS with Windows NT, you must install
Service Pack 4 (SP4) or later before you install Windows 2000.
Windows 2000 uses a new version of NTFS (sometimes called
NTFS 5) that adds features such as disk quotas and encryption.
The original release of Windows NT can't read or write this new
version, but SP4 contains an updated Ntfs.sys driver that
enables Windows NT 4 to read and write to NTFS 5 volumes.
(The new features are unavailable from Windows NT,
however.) When you install Windows 2000, it converts all
mounted NTFS volumes to the new format.
• If your computer is a member of a domain, each installation of
Windows NT and Windows 2000 must use a different computer
name. The computer account on the domain controller
associates the computer name with each installation's unique
security identifier (SID). As a security measure, the domain
controller refuses entry when a logon request comes from a SID
that's different from the one associated with that computer name
in its security database. You simply need to create a computer
account - with a different computer name - on the domain
controller for each Windows NT/2000 installation that will
participate in the domain.

Importing Complex Disk Configurations

If you install Windows 2000 on a system that already has
Windows NT installed and if the system has existing volume sets,
stripe sets, stripe sets with parity, or mirror sets, you must import
the disk configuration so that Windows 2000 can access those
volumes. To do so, follow these steps:
1. In Windows NT, use Disk Administrator to save the disk
configuration to a floppy disk. (In Disk Administrator, choose
Partition / Configuration / Save.)
2. After you install Windows 2000, use Disk Management to
import the configuration. (In Disk Management, choose
Action / Restore Basic Disk Configuration.)