I emptied a directory and the size of it does not change, it still says the previous size. Is there a way to reset the size of a directory?

What size does it say it is? How are you getting the size? "ls -l" or through a graphical interface? You can find the size of a directory with "du -hs /path/to/directory". The "h" means to display in human readable format (eg 4.5K, 1.6M, 12G etc) and the "s" supresses the output of every recursive directory so you just get the one total size for the lot.

Just thought....are there ant hidden files in there? You can list them with "ls -a", hidden files and directories start with a "."

directories are files which never shrink. A directory "file" contains the names of its files and other info. On my linux, minimum directory size is 4096. If the number of files in the directory gets large enough, the size expands in multiples of 4096. If all the files in the directory are removed, ls -ld Dir will still give the same size. rmdir Dir; mkdir Dir minimizes