原帖由： mayer ,
Part of SWs statement is correct, your early 2009 does not need the thermal heat sensor. The 2010 and later does. Here's are the drives that will work with your machine. What you put in depends on how much storage space you need and just how much wear that old drive has. A 256 SSD works very well in this machine. It can also be set up as a fusion drive but with an eight year old hard drive may not be advisable. But your budget is large enough to replace that drive with just another standard drive for storage and add your SSD. With two new drive setting up a fusion drive would not scare me.