Update to Revision vs. Revert to this Revision

If I want to undo a bad commit . . .

1. If I go into the TortoiseSVN log , right-click on the revision I want to
roll back to, and choose "Revert to this Revision," Tortoise updates my
workspace. Then I can commit, effectively rolling back the repository.

2. If I just go into the context menu for my working copy and choose Update
to Revision, Tortoise updates my workspace. Committing, however, has no
effect--the commit dialog tells me there have been no changes to my files.

I'm sure this difference is fundamental to SVN, but I'm missing it, and
perusing SVN documentation hasn't clarified it. Would anyone be willing to
shed some light on this?
Received on Tue Feb 13 22:28:33 2007