Hi All, I have a FORTRAN program, which needs to open a new file and write information to it. I only want the main processor to do the writing, so I did this: IF (IMRANK .EQ. 0) THEN OPEN (IDRUNT(IDEM),FILE=DIRFIL(IDEM), & ACCESS='DIRECT',RECL=LREC_DIR) END IF However, no matter how many processors I specified for the program, after the parallel program finishes, the file (121M) generated by the main processor is different from the one (30M) generated without paralleling. Can someone provide any insights? Thanks. _________________________________________________________________________ The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you Received this in error, please contact the sender and delete the material from any computer. _________________________________________________________________________