Hi, I have been running my Samsung 850 Evo SSD via usb for a couple of weeks now with no issues. I took the plunge and opened up my iMac and installed it internally (I have a 27" Late 2009, Yosemite 10.10.3). Two things, 1st I guess is common but I am a little confused about. The HDD fan is now whirling at full speed - I expected this and thought that I could sort this via software, but none of the fan control software works (HDD Fan Control Monitor, SSD Fan Control, SMC Fan Control, Macs Fan Control) none of them do anything to the fan. Am I missing something as others seem to get this to work? I am keen on sorting this with a hardware fix, less keen on 'shorting' the sensor cable than I am fitting a sensor like on the ODD - is this possible to do? Or is the only way to sort this to 'short' it? Can anyone point me in the direction of instructions on how to do this? Just to note I fitted the SSD via a 2.5 to 3.5 adapter into the space the old HDD drive occupied, the ODD is still fitted internally and I am using the sensor fitted there to regulate the ODD's fan speed; I'd want to fit a similar sensor to the HDD fan that the ODD has. 2nd, the drive is now being run on the internal SATA cables but it is slower (boots a little slower, opens apps a little slower) than when I had it running from USB 2.0. Again am I missing something that I need to do to get this drive running faster? I thought that running it directly off the SATA cables internally would speed the data transfer up. Thanks for taking the time to read this, and my gratitude to anyone who can offer any help.