I'm running pre4 on a 77GB file. It seems like the hash table is taking a long time to be built. I'm not sure what is involved in this step but as an example the following is logged during a run: send_files(11, priv1.edb) send_files mapped priv1.edb of size 79187419136 calling match_sums priv1.edb <f.st...... priv1.edb hash search b=131072 len=79187419136 built hash table for entries 0 - 52427 built hash table for entries 52428 - 104855 built hash table for entries 104856 - 157283 built hash table for entries 157284 - 209711 The first two hash table entries (0 - 52427 and 52428 - 104855) took only a few minutes. The next two entries written to the log file have taken several hours. Does this make sense? Should the entries take so long to be built? Rob