Trouble with recovering disc space

Dear list,

I have the following issue with recovering disc space...

Interscan Web Security Suite(Trend Micro gateway antivirus appl.) uses
Postgres database to store access logs(to the internet) in table tb_url_usage.

This table occupies approximately 12GB based on oid:

-rw------- 1 iscan iscan 1073741824 May 15 14:37 48495427
-rw------- 1 iscan iscan 1073741824 May 15 02:00 48495427.1
-rw------- 1 iscan iscan 1073741824 May 15 11:25 48495427.10
-rw------- 1 iscan iscan 1073741824 May 14 02:01 48495427.2
-rw------- 1 iscan iscan 1073741824 May 14 02:01 48495427.3
-rw------- 1 iscan iscan 1073741824 May 14 13:34 48495427.4
-rw------- 1 iscan iscan 1073741824 May 14 13:34 48495427.5
-rw------- 1 iscan iscan 1073741824 May 15 14:37 48495427.6
-rw------- 1 iscan iscan 1073741824 May 15 13:19 48495427.7
-rw------- 1 iscan iscan 1073741824 May 15 11:58 48495427.8
-rw------- 1 iscan iscan 1073741824 May 15 11:30 48495427.9
-rw------- 1 iscan iscan 399007744 May 15 09:07 48495427.11

Now, if I run a DELETE(some rows) on this table after that VACUUM FULL it
does not return any space to the operating system. These files remains. If I
am right, VACUUM FULL should decrease the physical size of the table, am I?
May I delete som of these files? Or how can I free up space on filesystem ?

I am running Postgresql version 8.0 on Fedora Core 4. If you need some
additional information I send you...

Please any advise could help!

Kind regards,

chris

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