Subversion doesn't distinguish between filesystem space and
“branch” space; branches and tags are ordinary
directories within the filesystem. This is probably the single
biggest mental hurdle a CVS user will need to climb. Read all
about it in Chapter 4, Branching and Merging.
Warning
Since Subversion treats branches and tags as ordinary
directories, always remember to check out the
trunk
(http://svn.example.com/repos/calc/trunk/)
of your project, and not the project itself
(http://svn.example.com/repos/calc/). If
you make the mistake of checking out the project itself,
you'll wind up with a working copy that contains a copy of
your project for every branch and tag you
have.[62]
[62] That is, providing you don't run out of
disk space before your checkout
finishes.
