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Join Date: Apr 2009
02-18-2010, 03:17 PM
First off, I was slightly wrong above. Adjusting the AAM setting can reduce clicking during use at the expense of speed, but a separate setting needs to be adjusted to eliminate noisy head parking during idle moments.
In Linux, I'd use "sudo hdparm -B 254 /dev/whatever_device" in a terminal to keep a laptop drive from parking the heads aggressively. As for a similar OSX command, all I can say is: Google "osx hdparm"
Mini 1012 | SSD | Intel 6200 Wifi | Ubuntu 11.10 64bit
Join Date: Aug 2009
Location: Upstate New York, U.S of A.
02-18-2010, 05:38 PM
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Join Date: Feb 2010
02-18-2010, 08:35 PM
I mean yes you can, and OSX has a few programs that do this for you
so you don't need to do anything in terminal. HDAPM I think is the name
of one of them. But, when you adjust the value you are telling your drive
not to park its heads as frequently, you get a hotter running drive.
In a system like the Dell Mini that would run very hot.
In my Mac Mini I adjusted the APM value, it has a value of 1-255 (right?),
so I set it around 250. Yet it still clicked.
Every 6-12 seconds a soft click. The only way to actually get rid of it is
to go to 255 and actually disable the head parking. Think about that for a
moment.. your drive is supposed to park its heads sometimes.. and totally
getting rid of that is a recipe for disaster.
In any case, it is (from my research), OSX's power management features
not getting along with some of these newer 7200 high performance
drives. I have heard of some people getting clickers, some not, but I was
so fed up that i reverted back to a 5400rpm drive.
You can also set HDAPM to run every time you start your Mac, which I
did. I just got rid of it because my info program was showing my drive
running significantly hotter.
Also each time your drive loads and unloads its heads, it is a full load
and unload cycle. There are programs to show you exactly how many
Load and Unload cycles that your hard drive has accumulated. My
brand spanking new 7200 drive already had a few THOUSAND after only
3-4 days of use. Not cool when the drives are rated for 3-600,000 before
they are rated to fail. At that pace, my drive would be rated to fail after
It doesn't really mean your drive is a failboat waiting to happen.. but it
is unsettling to say the least (especially if your a poor college kid) and
plunk down a hundred smackers for a drive and it does this.
These drives demand power (especially the Black drive), and OSX doesn't
want to give it to them. There has been buku threads of irritated people.
Just go to mac forums and search for 7200 clicking or 7200 soft click for
all the threads. Some people get clickers and some don't.
Western Digital has been quoted as saying, "Apple includes code for their
7200 drives that they provide that alters APM to their own specifications."
I would include a link to that thread but it was months ago.
Pastie << self: Western Digital, OS X, S.M.A.R.T, and Load Count
That might make an interesting read. It also shows how to get your load
and unload count. I mean, yah you can alter your APM... but why should
you have to?
I have heard that the Hitachi drives and Toshiba drives play nicely
with OSX and I have been looking to get one. Or maybe try another
7200 WD Black. Honestly, that drive was waaaayyyy fast. I miss the
speed from it. Programs would start with one bounce of the icon, and the
OS would load under like 20 seconds.. great power with that drive.
In any case that is just my experience with this situation.
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