I don't know but you could try this, as man dd says that it can have stdin/out also.. dd ibs=something obs=something if=/dev/hdX | tee /dev/hdY > /dev/hdZ Just try if you have time. -- Rohit +9122 5692 2108 G9,Floor-1,Chandivali : SDE : TLSI : 9821394599@bplmobile.com The information below is compulsorily added for non-mahindrabt recepients. ********************************************************* Disclaimer This message (including any attachments) contains confidential information intended for a specific individual and purpose, and is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited. ********************************************************* Visit us at http://www.mahindrabt.com