For most drives "sudo hdparm -B 254 /dev/sda" works
For some drives "sudo smartctl -o on /dev/sda" is needed before issueing "sudo 
hdparm -B 254 /dev/sda"
For some drives "sudo hdparm -B 255 /dev/sda" might be needed

IMHO it would be nice if hdparm would provide a single command which
turns down power management for all drives.

see also :
https://bugs.launchpad.net/ubuntu/+source/acpi-support/+bug/59695/comments/286
https://bugs.launchpad.net/ubuntu/+source/hdparm/+bug/172287/comments/1
http://ubuntuforums.org/showpost.php?p=3909494&postcount=552
http://ubuntuforums.org/showpost.php?p=3672087&postcount=18

-- 
laptop-mode-tools uses hparm -B 255 instead of 254
https://bugs.launchpad.net/bugs/172282
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