Comment 20 for bug 595138

Thanks Bob for pointing me to this bug! On 2011-10-16 I filed a duplicate of this bug: https://bugs.launchpad.net/bugs/875719. Apologise for that. Here's a summary of my observation:

hdparm -S worked with 10.10. But with 11.04 my external hard disk (Seagate) connected via eSATA ExpressCard on a ThinkPad X200s doesn't spin down anymore on inactivity timeout set to 12 (1 minute). I'm still able to spin down the disk with the -Y option---but a few seconds later it spins up again. hdparm with -S set to 1 works, too. But the disks spins up again after 15 seconds. I guess some process accessing the disk prevents the disk to spin down which only occurs with -S set up high enough. How can I detect which process prevents the disk from spinning down? This hard disk is my backup disk and only in use every 4 hours by a cron job.