SSD help

You can get a Samsung 840 SSD, 500GB for about $339 from Newegg.com right now. That's a real good price and it's a quality product. I have one in my iMac and it works great.

 

I have the Samsung 830 128gb in my iMac late-2007. Runs great as well. I got 128gb though I really recommend 256gb minimum.

 

There are issues in replacing the drive in that there is some kind of drive temperature sensing in those drives that need to be compensated for. If not the fans run full speed. I hear there is some software out there that might cure this.

Also, I dont think there is an extra sata port on your board so you can't add to the hard disk, you need to replace it. Leading to the sensor/fan issue stated above.

----------

How do you secure the smaller sized disk in the iMac?

 

That is correct on the fan issue and my 2010 model has it as well. I fixed it by creating an Automator workflow and using smcFanControl. I can post the steps later if anyone would like (I'm not at that machine right now).

I bought the 840 SSD kit which comes with an aluminum mounting bracket that the SSD mounts to and then you mount the bracket into the spot where the HDD used to be.

You can also get a kit from iFixit.com which adds a second SATA connector to the main SATA bus so you could keep the HDD and add the SSD if you want.

There is a lot of great information in these threads as well:

SSD Buying Guide

The Samsung 840/840 Pro SSD Thread

 

Controlling the fan speed in Mac models after an SSD upgrade.​

Steps:

1. Download the app smcFanControl
2. Install smcFanControl into your Applications folder
3. Open Automator
4. Create "New Application"
5. Go to Utilities > "Run Shell Script" and delete the word "Cat"
6. Copy the following code into the Shell Script:
7. Code:

   /applications/smcfancontrol.app/Contents/resources/smc -k F1Mx -w 1770

8. Test the Shell Script by clicking on "Run" and your fan should stop running at full speed
9. Save the application to your SSD as "maxfanadjustment"
10. Open System Preferences, go to Users & Groups, the tab for Login Items
11. Click the "+" to add a new application and navigate to the Automator file you just created and add it.

​

What the above process will do is correct the out-of-control fan after the installation of the SSD and removal of the HDD. Apple uses a HDD temperature sensor which connects to the HDD's jumper block. Since SSD's don't have a jumper block, the computer think's there is a problem with the HDD and runs the fan at max speed.

You can run the Automator application any time the fan is out-of-control and by placing it in the Login Items it will automatically run it when you start the computer. If it's not in Login Items, you will have to manually run it because this isn't a persistent fix.

Now, if you're like me, you rarely shutdown your Mac and instead only put it to sleep. I've found that upon wakeup of the Mac, this Automator script needs to be run again because the computer "forgets" about it.

I found a neat little app in the Mac App Store called Scenario, which costs $4.99 US. It can set up actions to be performed upon events, such as "Computer wakes from sleep".

Upon installation, it creates a Script folder where you can put Automator scripts for it to run. Copy the script you made earlier and put it in the "Wake scripts" folder.

Now when your computer is awakened it will run this script for you and you won't need to run it manually.

*There is one event that will cause the fan to spin out-of-control that so far requires you to run the script manually. That is "Wake for network access" which is found in System Preferences > Energy Saver.

I have found that when I put the Mac to sleep and then later use the Apple TV to access my iTunes library, which uses the Wake for network access protocol, the fan spins up to max. I haven't figured out a way to get the script to run upon this event yet, so what I've done is set my Mac to never sleep, but to put the display to sleep after 15 minutes.

Update: See my post here for a permanent and full solution.

 

I don't think the older iMacs have the drive sensor fan problem. I have a 2008 iMac that I swapped my HDD out for an SSD. There is a temperature sensor that just sticks to the surface of the drive; it is a separate wire from the SATA cable. I think you get in trouble with the newer iMacs that use an integrated temp sensor/SATA cable.

I could be wrong, however I have no issue with my 2008 iMac in reading the drive temp and adjusting the fans accordingly. I just had to make sure that I reapplied the drive temp sensor to the surface of the drive.

 

Seems Apple has been using different methods to gauge HDD temperatures between models. My 2010 iMac has a cable lead that plugs into the jumper block of the HDD rather than yours which has a lead taped to the case of the HDD. I understand the newer (than mine) models don't have this problem at all. Probably because Apple now offers SSD's with them, while they didn't on the models you and I have.

 

I don't know why I didn't think of this at the time, but I believe I found a better way to keep the fan under control.

I took a bad hard drive and removed it's controller board which has the jumper pins on it and put that inside the iMac. I connected the HDD sensor wire to the jumper pins, just as it was when the original HDD was inside the machine and operating. Only this time, it's just the controller board with no power. I used a small piece of 2-sided 3M tape to keep it from moving around and stuck the controller board to the SSD.

I have removed smcFanControl from my start up items along with the app Scenario and my AppleScript that I used to control the fan speed during various system events.

I've restarted the machine a couple of times, put it to sleep and woken it up (which is the part where I couldn't control the fan with software), put it back to sleep and accessed the iTunes library to play a video on the Apple TV and so far everything is working and under control.

I figured that Apple was only measuring the temperature of the HDD via the jumper pins themselves and not actually reading any temperature data being sent by the HDD or its controller.

Basically, I just added a dummy load to the sensor and as far as it knows, there is a functioning HDD attached to it.

I'm running through all my start/restart/sleep/network access tests a second time now, but I think I got it.

 

here is a thread which talks specifically about your iMac:
http://forums.macrumors.com/showthread.php?t=1433551
Read #3
I believe you wont have a temp sensor / fan problem. Apple started the special HDD thing with the late 2009 iMAC.