Without this, udev will be triggered into spinning up the drive again

It was rejected as not general enough:
https://bugzilla.redhat.com/show_bug.cgi?id=561876

diff -Naur -Naru sdparm-1.04/src/sdparm_cmd.c sdparm-1.04-pb/src/sdparm_cmd.c
--- sdparm-1.04/src/sdparm_cmd.c	2009-08-27 17:28:11.000000000 +0000
+++ sdparm-1.04-pb/src/sdparm_cmd.c	2010-02-04 15:36:04.617020852 +0000
@@ -403,6 +403,7 @@
         if (rwp) {
             if ((CMD_READY  == scmdp->cmd_num) ||
                 (CMD_SENSE  == scmdp->cmd_num) ||
+                (CMD_STOP  == scmdp->cmd_num) ||
                 (CMD_CAPACITY  == scmdp->cmd_num))
                 *rwp = 0;
             else