Create Database Error

A couple of days ago I tried to create a database and
got an error to the effect that I couldn't do that (no
more specific). I then tried to mkdir in my DATA
directory for a new database (as root), and I got
"Can't make directory--not enough space in DIR"). I
deleted everything and then did initdb again, and it
works fine. My tables were almost empty (I am just
experimenting), but I never "vacuumed"--could that be
the problem?

Thanks in advance (especially to all the people who
wrote such an amazing RDMS in the first place!)

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