>>>We have some computers running NT4 Workstation that are attached to clinical equipment. To help us keep running in the event of a hard drive failure, how can we mirror to a 2nd drive? Is there software that does this and we just pop in a 2nd hard drive, or do we need a special harddrive controller?. The current drive is an IDE.
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>>Fault tolerance is not built into NT Workstation - either upgrade the workstation to NT Server or Win2K Server, which support the fault tolerance mechanisms, or you'll need a controller with it's own support built in; for IDE, Promise Tech makes several that have this feature, but the cost is probably more than a minimal NT Server version, and likely will require you to reformat the existing partition.
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>Thanks Ed and Jim.

You are welcome. Glad to see my humble opinion agreed with Ed's guidance.