See this code piece http://lxr.linux.no/source/drivers/scsi/libata-scsi.c?v=2.6.18#L1049 1056 lba |= ((u64)scsicmd[2]) << 24; 1057 lba |= ((u64)scsicmd[3]) << 16; 1058 lba |= ((u64)scsicmd[4]) << 8; 1059 lba |= ((u64)scsicmd[5]); it can also be written as lba = be32_to_cpu(*(u32 *)(&scsicmd[2]) i wrote a simple code to test this and i found second one is several time faster than first one. if there any pitfall with 2nd way? Thanks Ming -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
