Great change (size of data dir) upgrading postgresql

Hello all!

I've upgraded postgresql from 7.2 to 7.4, and my data dir has
changed a lot:

S.ficheros Tamaño Usado Disp Uso% Montado en
/dev/hda1 1.9G 1.8G 64M 97% /usr/local/pgsql/data.old
/dev/hdb2 4.5G 357M 3.9G 9% /usr/local/pgsql/data

Is this normal? I've made some queries to the system and all the
data seems be there. Of course, the database goes faster than before
upgrading it, but I want know if I can delete this data.old directory.

Thanks in advance,
Carlos.

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