I forgot to add the ULL suffix. Now it is ok. I see you are using AIX. Do you have any experience with the STIOCMD IOCTL? The reason I ask is that I can't get it to work on AIX 5.2 with a FC tape drive. I do not see any problems with direct attach SCSI tape drive. With FC I get a errno 22 (invalid agrument). I am using the OST driver to access the tape drive. STIOCMD FCP fixes are mentioned on ATape fix list but I have a feeling it might not be supported by the OST driver. Thanks! -- View this message in context: http://www.nabble.com/ggc-3.3.2-on-aix-5.2-long-long-type--t890410.html#a2309006 Sent from the gcc - Help forum at Nabble.com.