This past article is being re-posted and continuously updated on this WordPress-powered blog so people can post comments and questions. This article was originally published in December of 2008.

My most recent and fresh complaint with Apple has to do with an annoying clicking sound coming from the hard drive (HDD) of my early 2008 Macbook. This is not to be confused with a much louder and constant clicking sound of a soon-to-fail HDD. This is a more subtile, yet annoying click that is most obvious when the computer is not under heavy processing use. I just purchased this product directly from Apple as a refurbished unit. Although the machine is technically a refurbished unit, it is actually completely new, at least the HDD was, as that is easy to check. This “click” sound is yet another example of when a “bug” is actually considered a “feature.”

It turns out that this “clicking” is part of a “power management system” that functions to save energy and reduce temperatures. For every “click” what’s happening is the heads of the HDD are parking, and the disk platters begin to stop spinning. But then the HDD’s heads quickly unpark, and then park again, and then unpark, and sometimes this happens every couple of seconds and becomes very annoying. It is most especially annoying when using a notebook computer in a very quiet setting. The click(s) can sound just like a ping pong ball being dropped on a hard surface.

This problem is most recognizable when one’s computer does not have many applications in use, and is sitting in a fairly idle state, like when one is trying to read from a website through a browser, and not doing much else that will tax the CPU and the HDD. It is when the computer is in this state that the HDD manufacturer’s (or is it Apple’s/*nix’s) power management system and the Operating system seem to not get along too well, and then come the click, click, clicks. What is most bizarre to me is that the clicks are somewhat random, at least to my limited knowledge. Sometimes, in what appear to be similar computer-use situations, there will be clicks, and sometimes no clicks.

This problem actually occurs on all Operating Systems based on Unix/Linux, including the Mac OS. As far as Windows is concerned, many say this problem does not exist, and some say it does. The folks who say that Windows Vista is not plagued with this problem claim it is because the OS accesses the HDD so very often, like every 4 seconds at a minimum, the HDD’s aggressive power management scheme never has a chance to kick-in and sleep the HDD and park the heads. Whereas the Mac OS Leopard 10.5 may access, or touch, the HDD every 8 seconds at the least, allowing the HDD’s over aggressive power management to sleep the drive (hence park the heads, and make an audible “click”) every few seconds. The same seems to apply to open source distros of Linux, however they seem to be on top of a fix. Maybe this is because the average linux user is quite computer-savvy, unlike today’s average Mac user.

This issue is not just about an annoying noise emitting from the HDD, all those clicks might be drastically shortening the life of the HDD. To computer geeks each one of those annoying ping-pong ball sounding clicks is known as a “Load_Cycle_Count” and every HDD manufactured has a limited number of allowable load cycle counts before the HDD fails! My particular drive will fail at around 600,000 load cycle counts. that number may seem high, but considering that the HDD in question is already at 22,731 “clicks” or load cycle counts (this number is easily ascertainable with the use of specific software) in under one month’s use, well, do the math. My HDD is pre-programmed to fail in 2 years. Many people have reported a much higher rate of accumulated “clicks” than my HDD has. I have an old external 80 gig firewire HDD that is running strong after 8 years of use!

The big mystery here is who is to blame? It is either the OS manufacturers, i.e. Apple, Windows, Ubuntu, or we need to look at the manufacturers of the HDD’s themselves. I actually think they both are to share the blame.

There are numerous forum threads running all over the web about this issue. Here are links to some of the best:

The clicks are annoying as all heck in a quiet room! None of the “fixes” to be found on the web seem to work, none!

1. HDAPM, nope. (OK, this one works, see below)
2. declunk, nope.
3. APM tuner, nope.
4. Turning off “put hard disk to sleep whenever possible,” nope.
5. disabling the motion sensor, nope.

UPDATE: Another new day, today being Tuesday, December 9, and I think my Macbook’s hard drive is intermittently clicking again! Noooooooo! I give up. Apple, Fujitsu, fix this for me. The HDD is clicking but maybe not as often, sure, that’s right, it is not clicking as often. Anyone who tries the band-aid fix above, please e-mail me, and let me know if you had any amount of success in ridding your notebook of the hard drive clicking.

Dialed up some live chat with a Fujitsu rep., here is how it went (spoiler alert: not so great):

Please wait while we find an agent to assist you…
You have been connected to Giancarlo .
Giancarlo: Welcome to our FCPA live chat service. How may I assist you?
Doug A: This HDD in question, combined with Apple’s Mac os 10.5.5 is a MAD CLICKING thing………..
Doug A: APM? / firmware tool is needed bad
Doug A: hitachi makes a tool to help correct this, why not fujitsu?
Giancarlo: What is the part number of the drive that starts with a CA0
Doug A: huh?
Doug A: Capacity: 232.89 GB
Revision: 0081000D
Serial Number: K43XXXXXXXXX
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Mac OS 9 Drivers: No
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
Giancarlo: Where did you get the drive?
Doug A: OEM, earily 2008 macbook, Apple
Giancarlo: Had a feeling just looking at the firmware revision.
Giancarlo: Any firmware requests would need to go through Apple
Doug A: so you have nothing for me?
Giancarlo: I’m sorry I do not. Apple (and other companies) take our drives and flash their firmware on the drive, thus taking ownership of that aspect
Doug A: Thanks. It’s official folks, Fujitsu is “passing the buck” and not taking ownership on this issue (for my blog).
Giancarlo has left the session.
Your agent is experiencing technical difficulties. Please stand by while we re-establish contact or find a new agent…
You have been connected to Giancarlo .
Doug A: So, this has nothing to do with an over-aggressive Power Management System that is built into the drive itself?
Doug A: Are you still here?
Giancarlo: I’m sorry I have nothing regarding this
Doug A: How about a manager?
Doug A: i.e. your supervisor. Are you still with me?
Giancarlo: I’m looking for one that is available
Giancarlo: I’m sorry I’m not getting anyone available at the moment but I can do the next thing and send this over to engineering to see if they can go through some channels
Doug A: My email is I would really like some answers to this. Apple does not want to take ownership on this situation that seems to be some sort of conflict between your HDD power management, Apple’s Sudden Motion Sensor, and something? Linux suffers from this same problem, so HDD manufacturers need to take a bit of ownership on this widespread problem. There are forum threads all over the web about the HDD clicks!
Giancarlo: Okay I’ll pass this on to engineering and see what they have to day
Giancarlo: I mean say
Giancarlo: Sound like a plan?
Doug A: I will be waiting for an answer. thank you. If I hear nothing, I’ll be back to inquire some more, OK?
Giancarlo: Very good
Doug A: document and save this session for further reference, OK
Giancarlo: It already is
Your session has ended. You may now close this window.

OK, Apple, it looks like the ball is in your court…

UPDATE: Fujitsu, the manufacturer of the occasionally-clicking hard drive in question, has officially washed their hands of this problem. I received an e-mail from them this morning. This is what the contents of the communication were:

I sent the inquiry to my engineering contact who also consulted with a couple of others; one of the a Macbook user himself. They are not aware of any problem with the M120 using APM with Apple’s Sudden Motion Sensor. There also have not been any new Firmware that exist. They say, “Use of any of the three APM modes should not cause the drive to make clicking noises.” Best regards, Giancarlo, TSE Sr.

I guess it is time to start dealing with Apple. But I know what they will do. Aple will simply pull the drive in question, and throw another brand into my Macbook, and the different branded drive will, most likely, also click. As I presumed before, this is not an issue with a specific HDD manufacturer, this is an issue with the Mac Leopard OS, or is it? The Fujitsu rep. did seem to become befuddled the moment I mentioned “an over-aggressive Power Management System that is built into the drive itself.

UPDATE : (12.16.08) Today I successfully installed HDAPM. I know that it is successfully installed because using a free open-source app. called Smartctl (this Apps seems to not work with Snow Leopard 10.6!) I can see that my load_cycle_count is not increasing! I also noted that I cannot hear the unique “whirling” sound of my notebook computer’s hard drive changing speeds, i.e. the spinning-up and spinning-down of the platters. I also cannot hear the dreaded clicking sounds any longer. Basically, with HDAPM, I have set my HDD to maximum power / minimum disk “spin down” and head-parking. Heat is not an issue at all; using a great utility called iStat menus, I have seen absolutely no increase in the temperature of my HDD, or any other part of the computer.

Installing HDAPM is fairly easy for anyone who is used to tinkering with their computer, just be sure to follow the instructions that can be found on the internet with a simple search. I had to do steps 9 & 10 of the HDAPM install, which require one to download an application called Ligon, and create a new .plist (preference file) for HDAPM. The load_cycle_count of my hard drive is now stopped at a “raw value” of 35,969 after 720 hours of use.

THERE IS ONE PROBLEM WITH THIS–sort of, after rebooting the notebook computer I realized that HDAPM had reverted to its old ways for me, with a console message that HDAPM failed, not supported. I was able to reinstall HDAPM after I deleted the /usr/local/bin folder and the HDAPM app residing inside of it, as well as the HDAPM .plist that was in the library/launchdaemons folder, rebooted, and did all the same steps to originally install HDAPM on my notebook computer. What a PITA! Not sure if I want to do all those steps every time I reboot…but it is the only solution I have found to get control of all the hard drive clicking and the rapidly increasing load_cycle_count.

UPDATE  (12.20.08-FINAL UPDATE!): I got an email from “Felix” who provided the final piece to this puzzle. He recommended that I place HDAPM in a slightly different location: /usr/bin, NOT /usr/local/bin. After doing this, HDAPM continues to work across reboots and restarts. I decided to even ditch the launch daemon .plist and just type “hdapm disk0 max” in the Terminal after any reboot. So, for all of you out there who have this problem of HDAPM not continuing to work after a reboot, remove all parts of it like I stated in the paragraph above, restart (maybe go ahead and zap the pram–hold down Option-Command-P-R until you hear 3 chimes) and then reinstall HDAPM in this slightly different location. It should work, it worked for me. YES!

UPDATE (12.31.08): HDAPM stopped working! I have not downloaded any OS updates or Security patches between update 6, eleven days ago, and now. Not sure how, but about 3 hours before Midnight I began to hear disk clicking sounds. They may have starting happening earlier in the day, when it was much noisier, not sure exactly. Went into the Terminal and entered the command “hdapm disk0 max” and for the first time in 11 days Terminal gives me back the message I thought I had done away with, “Setting APM level to 0xfe: FAILED: APM not supported.” Do not know what to think except–fail, NO.

UPDATE (01.02.09) I decided to leave HDAPM where I last installed it because it did not hurt anything by it being there. Today, for kicks, I typed the “hdapm disk0 max” command in the Terminal. For whatever reason, it worked again, giving me the message “Setting APM level to 0xfe: Success.” Not sure what to think now. I did do one system change, using Little Snitch, I denied allowing an outbound connection by automountd, which was trying to connect “UDP connections to port 111 (sunrpc) of mach_kernal.domain.actdsltmp” I have no idea if that outbound connection has anything to do with HDAPM working or not. I do find it odd how HDAPM seems to wax and wane in its ability to work…?

UPDATE (01.14.09) I wanted to post a final update and, what seems to be a resolution for this HDD issue. I have left hdapm set up in the same place that I put it 3 weeks ago–see update 6. Also, with the help of Little Snitch, I am still denying the specific outbound connection attempt by “automountd” mentioned just above in update 8. What I have found is that if I do a reboot or restart and attempt to load hdapm in the Terminal, hdapm will say it is not supported. The Terminal will continue to give the message that hdapm is not supported over numerous reboots and restarts. However, if I shut down the computer–as in, yes, a complete shut-down that requires you to hit the physical start button of your computer to start it back up–and then enter the command in the Terminal to start up hdapm and set it to maximum performance, it works every time. I am certain hdapm is working because all disk clicking goes away and my load_cycle_count is not increasing, except for when I choose to sleep my computer and the load_cycle_count will increase by 1. I must reiterate that I am not actually sure if denying “automountd” to connect with port 111 (sunrpc) of mach_kernal.domain.actdsltmp had anything to do with my eventual fix, but have not noticed any detriment for denying that specific outbound connection.

In conclusion, I must say that I know many people out there had a much easier time installing hdamp–lucky you. However, there are many people who were, or are, having a difficult time installing hdapm. A few newer oem HDDs that are common in Apple’s MacBook/Pro computers, like my Fujitsu, tend to be more difficult to get hdamp up and running on. Hopefully this long blog article can shed some light on the process for those of you out there having to wrestle with the annoyance of a soft-clicking hard drive. Also, hopefully the next Mac OS X update does not send me back to square one.

UPDATE (09.03.09) HDAPM has continued to work on my laptop through the OS X Leopard 10.5.8 update and also successfully works with OS X Snow Leopard 10.6. Occasionally with a reboot / restart the Terminal App will say “Failed APM not supported. However, every single time I shut down my Macbook and restart it with the power button HDAPM always loads successfully with the Terminal command “hdapm disk0 max” or, which ever other version of that command I choose to use, Like “hdapm disk0 250.”

UPDATE (11.13.09) I am currently running an Apple Macbook 5,2 (2.13 C2d, 250 GB Hitachi HDD, 4GB, 9400) and Snow Leopard 10.6.2. I no longer have any need for hdapm on this computer, as there is no clicking HDD in my current configuration. Whether it is the different model of HDD, different computer, a more matured Apple Mac OS X—now at 10.6.2, or a combination of any of these options, I have absolutely no clicking HDD. After 2 months of average use—550 actual hours—the HDD has roughly 3,500 load cycle counts, or an increase of 1 load cycle count every 10 minutes, which is extremely reasonable. Again, this is with no HDAMP, Sudden Motion Sensor is enabled, and put hard disks to sleep when possible is checked! It is important to note here that this Macbook is completely factory stock—all the memory, the hard drive, and everything else…but especially the hard drive which matters here the most—Apple factory stock.

UPDATE (01.04.10) In addition to the MacBook mentioned above, I am also now running an experimental setup in the form of a Dell Mini 10v with OS X Snow Leopard 10.6.2. The HDD in this Dell Mini is a Western Digital Scorpio Blue 160GB (WDC WD1600BEVT), and it is very loud. Not the traditional soft-clicking that is all too common with anyone on a quest for HDAPM information, but more like random seek movement and other “R2D2-Sounding” noises. These noises happen about every 5 seconds, or so. After one month of average use (250 actual hours) the HDD has roughly 28,000 load cycle counts—which is a lot of head parking, but not enough to equate each HDD noise—that happens about every 5 seconds on this configuration—with a load cycle count. Doing the math, I am receiving a load cycle count increase of 1 about every 30 seconds.

After trying every trick in the book, I think that HDAPM will not work with this setup. I also think Apple fixed clicking/noise for most of the HDD’s that come with newer stock Mac configurations—See my Update above, and execute a Google/Bing search for Performance Update 1.0 or Hard Drive Firmware Update 2.0the Performance Update had a short-lived life for Snow Leopard users, as it has been rolled into the 10.6.2 update (not sure about Leopard 10.5.8 users)—I assume the Hard Drive Firmware Update 2.0 has also been included in the 10.6.2 update, but I have not done the specific research to validate this guess. One can still download the Performance Update from Apple and dig into its contents with the app “Pacifist.” doing this reveals that Apple made changes to the IOAHCIFamily.kext, specifically the IOAHCIBlockStorage.kext…

The MacBook 5,2 (2.13 C2d, 250 GB Hitachi HDD, 4GB, 9400) mentioned above is whisper-quiet, even with the sudden motion sensor enabled, even with “put hard disk to sleep when possible” enabled, and even with no HDAPM installation. This Macbook does have the Performance Update 1.0 installed, however. I purchased this MacBook 5,2 right around the same time the Performance Update 1.0 came out, so I never got the chance to see if this configuration exhibited a noisy hard drive before the HDD Performance Upgrade 1.0 software update.

However, if you upgraded the hard drive in your MacBook, MacBook Pro, MacBook Air, and possibly even MacMini with an aftermarket 2.5 inch HDD, or if you are running some type of  experimental setup, you may still, to this day, be confronted with excessive HDD clicking, beeping, grumbling, seeking, head-parking and load cycle counts under OS X Snow Leopard (or Linux, or Windows on any computing device using a 2.5 inch HDD, as this phenomena is certainly not limited to Macs).

The Dell Mini with OS X 10.6.2 will not allow for HDAPM to be functionally installed. The netbook keeps getting the old “Setting APM level to 0xfe: FAILED: APM not supported.” I cannot get HDAPM to run on this setup under any circumstances. I also tried to use the Performance Update 1.0 on the Dell Mini but got the dialog box stating that my computer does not have eligible hardware.

With the Dell Mini 10v running OS X Snow Leopard so well, it is hard to gripe very loudly about a hackintosh with a slightly-loud drive that can only be heard late at night, when all is quiet. But with no fan and no optical drive, having a perfectly quiet hard drive—I don’t mind the slight sound of the platters spinning—would make this late-night, OS-X-Snow-Leopard-Powered, netbook-romance all the more hush-hush…

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This article has 16 comments

  1. dougit Reply

    I think, for the most part, Apple has fixed this issue with all their newer MacBook and MacBook Pro’s. However, there may be many people out there with older notebooks/laptops who are looking for some answers about their soft-clicking HDD’s…

  2. Brian Reply

    I have the original unibody aluminum macbook and still use HDAPM with Snow Leopard. No clicking after 1 year of reading your blog and following the steps. I still wish Apple would produce an update that actually fixes the problem..

  3. Owen Reply

    Thanks!!!!! Your tip on the Macbook sleep issue and your efax under printer panes solved my sleep problem!!!! I bought an HP wireless printer and my Macbook Pro sleep went from 1 second to 25 seconds!! I removed the HP from the pane and voila! Back to perfection.


  4. Roger Reply

    I have a brand new Macbook Pro and had this problem until I found your solution. HDAPM works exactly as you describe, I have to redo it after a restart. Thanks for your help


  5. Ram Reply

    i had the same problem and tried something which might not be a good idea: i shook the computer violently hoping to kind of reset or reactivate the motion detection system – it seemed to have worked.

  6. Pingback: Who has a large HD that doesn't click with Snow Leopard? - Page 3

  7. Robert Reply

    I think this is standard with most 2.5″ inch HDD nowadays. I have a playstation 3 and was wondering what this noise was for the longest time. The noise is just like you said, a click but not a horrible HDD failing head-crashing one. I’m glad to have gotten some reassurance on the internet. Nice read.

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  9. D4T3N7OD Reply

    Thanks for your detailed account of macbook hdd clicking! I found this page while searching not for solutions to get rid of the sound but the quick increasing of the load cycle counter.

    I upgraded an older macbook (late 2006 aka 2,1) with a bigger hdd – Hitachi 5k500.b – and while not hearing those clicks (i know them from other laptops running Linux, where hdparm would do the trick) and found the drive to be very silent, no clicks to be heard or beachballing to be experienced, but smartmontools revealed the rather rapid increase of the load cycle counter (register 193), up to 4 or 5 cycles a minute, no matter the Energy settings – the counter’s value already was down from 100% to 99% after just about 135 hours of operation! Obviously the load/unload mechanism is very smooth and quick.

    Using hdapm once and setting the APM Level to 192 (a setting I feel good about from my experience with Linux laptops with Hitachi hdds) seems to have done the trick. I am not sure whether i powered off the macbook since then, but i’ll report back after i did and whether i had to run hdapm again.

    Also, it is unclear whether owners of other hdd brands will need to rerun hdapm. From the OEM specs ($file/TS5K500.B_OEMSpecificationrev16a.pdf ), it could also be the so called ABLE algorithm used to reduce power consumption, which might have been turned off by setting an APM level.

    I also had to do maintenance on an older laptop with its stock WD 80GB hdd, running Windows XP Home, and found its load cycle counter at more than 3 million cycles without having any negative impact on that drives reliability or performance, so maybe inaudible clicks are proof for a rather smooth head load/unload mechanism and result in little wear? Just one thought, but i still like the counter to stay low.

    I’ll be back 😉
    and happy computing!

  10. johnsmith Reply

    For hdapm users who are having difficulty with the .plist script, you can try as I did and use automator instead:

    1) download hdapm and put in usr/bin/

    2) open up applications > automator
    and make a new workflow:
    Run Shell Script
    “hdapm disk0 max”

    3) save as an application and put it under your login items in system preferences/accounts/

    It should then run each time you login, basically just an automatic version of typing the command into terminal.

    To verify it’s working, open and run in automator and you should get the same message as in the article:
    “disk0: Hitachi/Seagate yadayada
    Setting APM level to 0xfe: Success.”

    I tested it a few times initially by sticking a “copy to clipboard” action after the shell script and just seeing the result when pasting… although there’s probably a better way to see the result (dialogue box?)

    Hope this helps someone. And thanks Doug!

  11. johnsmith Reply

    “To verify it’s working, open and run in automator and you should get the same message as in the article” –

    I meant under the results section of the Run Shell Script section.

  12. QuickSendSMS Reply

    What a great resource! You should promote it from the messaging console at Easy to use, nice and quick and you can text friends about it for free.

  13. bryan Reply

    guys ive been trying this for a long time and it is still not working… i downloaded the new version of Hdapm which supposedly works fine with osx Lion . I basically downloaded the file and installed the dmg, which directly put the hdapm file in the usr/local/bin folder…. it also automatically creates the hdapm.plist and puts it in library/launchdaemons folder… i restarted it and nothing happens. the weird thing is that every time i go into console and search for hdapm, it says hdapm: Setting APM level to 0xfe: Success, but when i go to terminal and execute it says disk0: Hitachi HTS545025B9SA02
    Setting APM level to 0xfe: FAILED

    HELP please…

  14. André Reply

    Hi everyone… Thank you all so much for your help and useful information, it is very much appreciated! The clicking noises were nearly driving me nuts since I like to enjoy the silence like Depeche Mode once sung 🙂

    Finally I managed to get rid of it by using this tool of this genius guy over here:

    I installed the package and entered > sudo hdapm disk0 max > followed by your password, and thats it, no clicking sounds anymore!!!


    Happy new year everyone !! 2012 coming
    Cheers, Andre

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