Installing 10.5.4 and Time Machine

Is it best to unmount and disconnect the external drive I'm using for Time Machine before I install the 10.5.4 update? This is the first update I've done since adding Time Machine.
I recall warnings in the past about disconnecting external drives before installing an update ... and I've always done that. Wasn't sure how Time Machine would handle being disconnected.
Thanks for any info.

Is it best to unmount and disconnect the external drive I'm using for Time Machine before I install the 10.5.4 update? This is the first update I've done since adding Time Machine.
I have never disconnected any usb or firedrives on any mac when I install clean OS or and upgrade or an update ever. I have never had an issue.
The before you install notes for the update do not mention disconnecting any devices.
http://support.apple.com/kb/HT1994

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