Linked by Andrew Youll on Tue 5th Jul 2005 16:46 UTC, submitted by HSQLDB 1.8.0 Released
Databases HSQLDB is the leading SQL relational database engine written in Java. It has a JDBC driver and supports a rich subset of ANSI-92 SQL (BNF tree format) plus SQL 99 and 2003 enhancements. It offers a small (less than 100k in one version for applets), fast database engine which offers both in-memory and disk-based tables and supports embedded and server modes.
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@JSIGHT
by Andrewg on Tue 5th Jul 2005 18:50 UTC

Check out the disk engine comparisons here. http://cluedup.com/hxsql/speedh.html

Seems to match what you were saying about tables on disk.