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Hi, you can use sg_start to start (spin-up, 1) and stop (spin-down, 0) devices. I also offers a parameter (-s) to send a synchronize cache command to a device, so it should write back its internal buffers to the medium. Be aware that the Linux SCSI subsystem at this time does not automatically starts stopped devices, so stopping a device which is in use may have fatal results for you. So, you should apply with care. I use it in my shutdown script at the end (before the poweroff command): # SG_SHUG_NOS is set in my config file rc.config # SG_SHUT_NOS="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15" if test -x /bin/sg_start; then if test "`basename $command`" = "reboot"; then for no in $SG_SHUT_NOS; do /bin/sg_start /dev/sg$no -s >/dev/null 2>&1; done else for no in $SG_SHUT_NOS; do /bin/sg_start /dev/sg$no -s 0 >/dev/null 2>&1; done