Yes, you're probably just seeing caching by Linux. You can try using raw/block devices or direct IO (depending on your OS) to avoid the OS buffering, or you can flush the Linux buffer cache prior to your test. ________________________________ Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.