All, I would like to use the "hdparm -r 0 /dev/hdc" capability with a current kernel to make a drive readonly. I tried it with 2.6.8 and it had no effect with my Adaptec 2-channel ATA PCI adaptor. (Similar to SIIG). I looked at hdparm's source and it is calling ioctl with BLKROSET. I found that in ide.h, but not ide.c (Not that I would recognise it.) Should it work? Has the functionality been deprecated? Is it a driver function or a controller function? I searched bugzilla (bugme.osdl.org) for "BLKROSET" and found nothing. Thanks Greg -- Greg Freemyer -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/