I upgraded my Macbook's internal hard drive from a 400GB Western Digital Scorpio Blue to a 750GB Scorpio Blue and restored from Time Machine. Despite my energy saver settings, the new drive shuts down after only 15 seconds of inactivity! Then, when I try to do anything, I get greeted with the beach ball while the drive spins up. If I play a song (with the sound off), the HD never spins down; I have been doing this to prevent beach balls. The drive spins down within 10 seconds of stopping the song.

Here are the results of pmset:

~$ pmset -g
Active Profiles:
Battery Power       -1
AC Power        -1*
Currently in use:
 womp       0
 lidwake    1
 halfdim    1
 sms        1
 hibernatefile  /var/vm/sleepimage
 disksleep  0
 sleep      45
 hibernatemode  3
 ttyskeepawake  1
 displaysleep   10
 acwake     0
 autorestart    0

And, SpindownHD shows that the drive is always active, even though I can hear it shut down. Is this a bad disk? Is there something else I can try? Sorta related, is there a way to monitor hard drive RPM?


2 Answers 2


You might try using hdapm to make the drive less aggressive about spinning down.


Sometimes, there are separate profiles for battery and adaptor power. Check if both profiles are set to never stop harddrive from spinning.

  • Yup, both profiles are.
    – Lou Zell
    Aug 26, 2010 at 3:27

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