By adding the line
hdparm -c3 /dev/hdX
to a bootup script.
For SuSE and probably other SYS V based systems
/sbin/init.d/boot.local works fine.
This enable 32 bit X-fer for you harddisk. On some systems it boost xfer
performance by 75%.
To test how much you gained type:
hdparm -t -T /dev/hdX
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