Sudden motion sensor not working with replacement harddisk?

I replaced the original harddisk of my Macbook pro (500 GB, 7.200 rpm, model no. HTS725050A9A362) with the retail version of the same harddisk (model no. HTS725050A9A364).
Now I'm missing the typical "click" when the sudden motion sensor parks the heads and I'm afraid it's not working - although "pmset -g" shows "sms 1".
Is there anything else I can check, e.g. enable head parking at harddisk-firmware level?
Thanks
Juls

For future reference, here are a couple of kb articles on the sudden motion sensor:
http://support.apple.com/kb/HT1935
http://support.apple.com/kb/HT1934
As has been said, Apple's Sudden Motion Sensor is not actually built into the hard drive. In fact, some hard drives with their own version of a sudden motion sensor like Seagate's G-Force Protection actually will set up a conflict with Apple's Sudden Motion Sensor.
I installed the same WD in my Mac as you did, and I hope you enjoy it as much as I have been enjoying mine.

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Sudden Motion Sensor not working after upgrade to WD5000BEKT HDD

Hi everyone, I just upgraded the hard drive on my Macbook Pro (2010) and I am very pleased with the performance of this 7200rpm drive, I have seen reads around 105MB/s and a pretty good boot time at 23s. But I used to be able to hear the hard drive stop when I moved the computer around before due to the Sudden Motion Sensor technology and since I have the new hard drive in it doesn't seem to work anymore. I have tried switching SMS off and on and it didn't change anything, also the drive is a Western Digital Scorpio Black without Free Fall sensor (I took that version on purpose so it wouldn't conflict with the SMS). Do you have any ideas on how to make it work again? Because I really like this feature on my Mac (I have dropped a laptop before so just in case it happens again). Thanks a lot for your help.
Scott

For future reference, here are a couple of kb articles on the sudden motion sensor:
http://support.apple.com/kb/HT1935
http://support.apple.com/kb/HT1934
As has been said, Apple's Sudden Motion Sensor is not actually built into the hard drive. In fact, some hard drives with their own version of a sudden motion sensor like Seagate's G-Force Protection actually will set up a conflict with Apple's Sudden Motion Sensor.
I installed the same WD in my Mac as you did, and I hope you enjoy it as much as I have been enjoying mine.

Motion Sensor not working in 10.3.9

I just noticed that my sudden motion sensor (SMS) isn't working. All other topics seem to be about problems on 10.4, but I'm on 10.3.9. The System Profiler shows the SMS to be active, but I tried two freeware apps and niether works. I've had my motherboard replaced in the recent recall as well as the topcase for the sudden sleep problem. Could that be linked? I tried running the Apple Hardware test and it came up clean.

I did find that article when researching the problem, but my profiler already says the SMS is active so it should be working. I wonder if disabling it, then re-enabling it would do anything.
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Sudden Motion Sensor not active

Hello,
My new MacBook's SMS is inactive:
    Machine Name: MacBook
    Machine Model: MacBook1,1
    CPU Type: Intel Core Duo
    Number Of Cores: 2
    CPU Speed: 2 GHz
    L2 Cache (shared): 2 MB
    Memory: 1.25 GB
    Bus Speed: 667 MHz
    Boot ROM Version: MB11.005F.B00
    SMC Version: 1.4f8
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But pmset says:
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Thanks,
Gilles.
MacBook Mac OS X (10.4.6)

Have you notice whether or not the motion sensor
works?
Apparently not (tested with iAlertU for example and with the software from http://www.kernelthread.com/software/ams/ams.html).
Yeah I'd probably take juhs10's advice and give Apple
a call if it's not working. It's a strange
occurrence. I would assume it's a software problem
but I'm not familiar enough with it to say for sure.
Thank you, I'll call Apple tomorrow to see with them.
Thank you for your help,
Gilles.

IPAD2 Magnetic On/Off Sensor not working after replacing power ribbon

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3. The multipin connector on the original cable has metal end cap reinforcements which are missing from the fake.
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Curnow1 wrote:
Download the original cover app
Write
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Sudden Motion Sensor on OSX 10.4.6 (iBook/PowerBook G4)

cheers!
according to http://docs.info.apple.com/article.html?artnum=303178, there is a problem with the sudden motion sensor on my ibook g4 14'.
my questions are:
1. is the sms really not working or is it just not showing up in the system profiler?
2. what should i do to bring sms (back?)to work? install a macosx-version prior to 10.4.3?
3. did the sms on my ibook ever work? bought it with 10.4.3 on it.
thanks for the answers.

Hi Mmkay,
Welcome to Apple Discussions
I am sorry, but just to make sure; Does the Sudden Motion Sensor not show up in System Profile (Getting Information About Your Computer (System Profiler)). In System Profiler > click on the Hardware tab > Look in the main window and you should seen Sudden Motion Sensor below Serial Number. Does it say State: Enabled? If it doesn't show up, bring it to your local Apple Store. I don't think that reinstalling the system software will make a difference.
Jon
Mac Mini 1.42Ghz, iPod (All), Airport (Graphite & Express), G4 1.33Ghz iBook, G4 iMac 1Ghz, G3 500Mhz, iBook iMac 233Mhz, eMate, Power Mac 5400 LC, PowerBook 540c, Macintosh 128K, Apple //e, Apple //, and some more... Mac OS X (10.4.5) Moto Razr, iLife '06, SmartDisk 160Gb, Apple BT Mouse, Sight..

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Sudden Motion Sensor working strange in Unibody!

I got a macbook pro 15 recently and i was trying out the applications on the Net. I tried smacbook which works with the sudden motion sensor of the hard disk...
Also i tried liquidMac app.. But what i realised is, they both didnt work for me well..
when i lay down macbook through left side, the liquid must go to left for example, but nothing happens, actually when i move laptop through forward or backward they are moving..
And when i run SeisMac to see the axis of Sudden motion sensor my result is like this
Y-axis positive is left up, right down (clockwise rotation)
X-axis positive is front up, rear down
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And suggestions?? Can it be broken or sth?
OR is there any way to play with this directions?
Should i send the laptop to service?

Are you saying the SMS does not respond in the same direction that you move it... or that certain axis do not function at all? The SMS is designed to protect your hard drive and nothing more. While developers have come out with some applications that can use it, there is functional benefit to which axis activates by which motion. The idea is that it detects "any" motion and locks the drive head to prevent damage. Now, if an axis is not functioning at all, you may want to look into that.

HT1935 In sudden motion sensor terminal it will not let put in my password...can any one help me?

While recording music was prompt...
Disk is too slow or System Overload.
(-10008)
The Sudden Motion Sensor may have parked the hard drive head, or the disk performance is not sufficient to read or write all audio tracks, or the system was not able to process all data in time
hard drive to slow...
followed direction but it would not let me enter password. No keys will work on keypad when trying

It's normal to see no characters on screen when entering the password for sudo - they're still recognised.
As Apple say at http://support.apple.com/kb/ht4103
When typing the user's password after the "Password:" prompt appears, you will not see anything appear in the Terminal window. Just type in the password and press Return. If the password is entered incorrectly, you will see the message "Sorry, try again" and be given another chance to enter the password correctly.

Is this a problem with the Sudden Motion Sensor or the HDD?

I have a MacBook that I purchased in Septemberof this year, and for a while I have been having a problem with the HDD. I understand that there is a Sudden Motion Sensor that parks the hard disk when the computer is moved suddenly, but every hour or so I can hear the HDD make a single loud click for seemingly no reason at all. The computer can be sitting on my desk with no applications running and this will still happen. This is not really much of a problem other than the annoying noise, but if I am playing music or a video from the HDD it will skip when it does this. I have disabled the SMS for now to see if it will make a difference, I am very careful with my devices so I do not fear that I will cause any HDD damage without the SMS, but I am not sure if it is a problem with the HDD or the SMS. Could anyone shed some light on this for me?

Well turns out disabling the SMS did nothing so I'm going to just take it in and hope it can be fixed.

Sudden Motion sensor active in Boot Camp using Win7 with lid closed

My quesrtion to the community is:
W/ an i7 MBP,
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OS running,
Is the Sudden Motion Sensor operational when the lid is closed with Win7 running?

Download an run memtest to check your RAM.
http://osxdaily.com/2011/05/03/memtest-mac-ram-test/
www.memtestosx.org/downloads/memtest422/Users_Guide.rtf
Don Montalvo was preventing the crashes by turning off SMS. However, replacing bad RAM was the ultimate solution.
https://discussions.apple.com/thread/3013824?start=0&tstart=0
https://discussions.apple.com/thread/3013824?start=45&tstart=0

Replacement HD and Sudden Motion Sensor

Is there a compatibility issue when choosing a replacement hard drive if the Powerbook as the Sudden Motion Sensor?

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Joe

Sudden Motion Sensor crash in MBP with SSD

Hi. I replaced my 2011 17" MBP's internal HD with one, then another SSD from OWC, going from 240 to 480.
As indicated in OWC's instructions, the Sudden Motion Sensor no longer applies and should be disabled with this command from the terminal:
$ sudo pmset -a sms 0
And using this command, we can see that the SMS is off:
$ sudo pmset -g
Active Profiles:
Battery Power                    -1
AC Power                    -1*
Currently in use:
womp                    1
halfdim          1
sms                    0
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But it's off.
FYI, I turned it off to try and stop this behaviour

Download an run memtest to check your RAM.
http://osxdaily.com/2011/05/03/memtest-mac-ram-test/
www.memtestosx.org/downloads/memtest422/Users_Guide.rtf
Don Montalvo was preventing the crashes by turning off SMS. However, replacing bad RAM was the ultimate solution.
https://discussions.apple.com/thread/3013824?start=0&tstart=0
https://discussions.apple.com/thread/3013824?start=45&tstart=0

Sudden motion sensor not working with replacement harddisk?

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