Seagate Momentus XT 750GB not spinning down at idle under MacOS Lion

Did you restore your data from your Time Machine afterwards?

When I did, I had the issues. When I didn't, everything worked just fine.

No, I did not restore from Time Machine. I just copied files directly from the backup to the fresh installation of Lion!

Have you checked to see if something has dorked with your power management settings with pmset -g ?

This is from my MBP which has been set with pmset -a disksleep 5 to spin down disks after 5 minutes:

Active Profiles:

Battery Power -1*

AC Power -1

Currently in use:

standbydelay 4200

standby 0

halfdim 1

sms 1

panicrestart 157680000

hibernatefile /var/vm/sleepimage

disksleep 5

sleep 30

hibernatemode 0

ttyskeepawake 1

displaysleep 2

acwake 1

lidwake 1

From Terminal:

sudo pmset -g

I have the same problem. After I installed the new harddrive in my MacBook Pro 2009 it stops running at least once per day. Mainly use the following programs: Chrome, Matlab, Mail, Preview and Adobe Pro. I have used time mashine to transfer all my programs to the new harddrive but I would rather not try to install all programs new because I use a lot of them.

Could there be a buffer problem with the hard drive?

Hi guys, I have this drive, bought 3 days ago. I have a mid-2010 13" Macbook Pro (7,1) with latest firmware. The XT 750 is a SM12 manufactured in july 2012. With a fresh Mountain Lion install, I can confirm that this drive indeed does spin down. My Mac goes to sleep automatically without problems. I have unticked "keep connection etc." and Find my Mac.

I don't know what the problem could be with yours, but for what I've been reading prior to buy it I'm sure that 2009 Macbooks needs the EFI downgrade from 1.7 to 1.6 due to sata speed problems.

The drive itself works fine, never saw a beachball yet, noticeably faster than the previous Hitachi 250Gb (it is also slightly noisier, like a small fan always on, but actually I was expecting far more noise, and that Hitachi was really totally silent. It has no vibrations whatsoever though). Very happy with the purchase (at least until it breaks).

Hope this helps.

Very unfortunate...

I use this exact drive and I originally had it in my Mid-2009 MBP, 2.66GHz. I did a clean install of OS X Lion then restored my files and settings from Time Machine. Not a single issue. I didn't have to do an EFI downgrade or swap the SATA cable or anything.

I now have a Mid-2012 MBP and i moved the drive over to this machine when I bought it. Again, I did a clean install of Mountain Lion then restored from Time Machine and it's running nicely. The drive goes off after the set period (although I rarely see this happen since I use Parallels and play music off the drive a lot, plus I have a really short sleep timer) and the machine sleeps after the right time as well.

Sorry you're having so much trouble, i love this drive and can't recommend it enough. The biggest problems i've read about were with the 500GB version due to an older firmware. You should maybe check what firmware your 750GB has.