Curiously, my hard disk appears to only support four values, indicating
that it possibly ignores most bits of the value. Any value <= 127 comes
back as 1.

dan...@thinkpad:~$ sudo hdparm -B 255 /dev/sda

/dev/sda:
 setting Advanced Power Management level to disabled
 APM_level      = off

dan...@thinkpad:~$ sudo hdparm -B 254 /dev/sda

/dev/sda:
 setting Advanced Power Management level to 0xfe (254)
 APM_level      = 254

dan...@thinkpad:~$ sudo hdparm -B 253 /dev/sda

/dev/sda:
 setting Advanced Power Management level to 0xfd (253)
 APM_level      = 128

dan...@thinkpad:~$ sudo hdparm -B 127 /dev/sda

/dev/sda:
 setting Advanced Power Management level to 0x7f (127)
 APM_level      = 1

My disk is a Samsung HM251JJ, firmware version 2AA00_00

-- 
[maverick] HD spins down all the time on AC
https://bugs.launchpad.net/bugs/606706
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