Table corruption at MySQL 4.0.0 shutdown ?

[Fournier Jocelyn [Presence-PC]]

Hi,

I noticed an annoying behaviour with MySQL 4.0.0.
I have 11 tables with a lot of rows (about 1 Million and more) which are constantly 
updated by a php script.
It seems after a shutdown of mysql (mysqladmin -uroot -p shutdown) and a restart, some 
tables are corrupted (and not the same, it randomly occurs), and I have to run a 
myisamchk to repair them.

Here is the structure of the table :


CREATE TABLE searchhardwarefr9 (
   mot varchar(30) NOT NULL,
   topic mediumint(8) unsigned DEFAULT '0' NOT NULL,
   date date DEFAULT '0000-00-00' NOT NULL,
   pseudo varchar(35) NOT NULL,
   numreponse int(10) unsigned DEFAULT '0' NOT NULL,
   PRIMARY KEY (mot, pseudo, date, numreponse, topic),
   KEY pseudo (pseudo, date, numreponse, topic),
   KEY numreponse (numreponse, topic),
   KEY topic (topic)
);

-=[root@s15]=(/usr/local/var/Hardwarefr)# myisamchk -o searchhardwarefr9.MYI           
                                 <(17:31:25)
- recovering (with keycache) MyISAM-table 'searchhardwarefr9.MYI'
Data records: 977549
Duplicate key  1 for record at   30977704 against new record at   30946580
Duplicate key  1 for record at   30977736 against new record at   30946612
Duplicate key  1 for record at   30977768 against new record at   30946644
Duplicate key  1 for record at   30977796 against new record at   30946672
Duplicate key  1 for record at   30977828 against new record at   30946704
Duplicate key  1 for record at   30977860 against new record at   30946736
Duplicate key  1 for record at   30977896 against new record at   30946772
Duplicate key  1 for record at   30977928 against new record at   30946804
Duplicate key  1 for record at   30977960 against new record at   30946836
Duplicate key  1 for record at   30977992 against new record at   30946868
Duplicate key  1 for record at   30978024 against new record at   30946900
Data records: 977538
myisamchk: warning: 11 records have been removed

Any idea ? (hardware related or mysql related ?)

Thank you :)

Jocelyn Fournier
Presence-PC