WD says the software can manage several devices, so I think you don't need to reinstall... unless you got a newer version of the software, which would be able to manage the previous device.
To be really sure, start using the new device with the old software and see how it goes. You can always reinstall the software later.
I just purchased a My Book Essential 2TB and trying to backup my Mac OS X? I am able to see all the...
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I just purchased a My Book Essential 2TB and trying to backup my Mac OS X? I am able to see all the info but it is not letting me use backup. Is it for windows only? And if so, what do I need?