Losing data

I have had a serious loss of data and wondered if anyone could shed any
light 
on what may have happened.
My users have been writing re****ts on students. No error messages have
been 
produced and when called back up the re****ts seem to be present at the
time 
of writing. However, next day they have disappeared, and they do not
appear 
in a pg_dump. They seem to have been kept in memory and never written to 
disk.
We are using Zope and connecting to Postgres through psycopg on Centos 5.
I suspect a hard disk failure but any other ideas would be welcome.
Would these re****ts be in the WAL?
regards
garry

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