So what exactly does a Momentus XT do in the optibay

Putting the hybrid drive in the optibay will be just like putting the hybrid drive in the main bay. If you do not use it as a boot drive, it will still put your most commonly used files into the flash memory.

nudoru said:

Thanks ... figured that part would work - it's just with people saying there are problems with it. Just interested in what that meant.

Click to expand...

What they likely mean is that because the MoXT is a SATA III drive, it won't work reliably in the optibay of a 2011 uMBP-15. The 2011 model had issues running SATA III drives in that spot (supposedly because of RF interference with the SATA controller cable). This is a well documented issue with any SATA III drive, not just the MoXT. The 2010 model will work fine with a SATA III drive in the optibay, but will max out at slightly less than 300MB/s speeds (which is more than enough for the MoXT), and the 2012 model will work fine and max out at speeds twice as high, but the 2011 model just won't work reliably.

Some people have claimed that the MoXT won't work as part of a DIY Fusion drive because it's a hybrid, but this is an ill-informed view as the computer can't tell that it's a hybrid. To the computer, the MoXT looks like any other 7200rpm HDD, but with a MUCH bigger than normal cache.

So, the answer to your original question is that the MoXT isn't going to work well in the optibay your computer. The fact that your current WD Blue is reporting a 3GB/s negotiated speed suggests that it's a SATA II drive, which is fine in the 2011 optibay, so you'll likely just have to stick with that.


___