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Event ID: 34 Source: Disk

The driver disabled the write cache on device \Device\Harddisk1\DR1.
Windows 2000 disables write cache on domain controllers in order to prevent Active Directory database corruption in case a power outage occurs.

ME324916 says that this may occur when you are using an Iomega Zip 250 drive to copy files to and from your hard disk (The Iomega Zip 250 drive does not support requests by the operating system to turn off write caching.)
According to Adaptec, this is a "normal" startup message on Domain Controllers. See "Adaptec Support Answer ID: 1504" for additional information about this event.
Write caching was disabled. This message is logged for informational purposes only. See MSW2KDB for details on this event.

ME233541 describes some of the advanced performance options available if you view the properties of a hard disk. It gives information on the "Write Cache Enabled" feature.

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