Definition: Given an Amazon customer review, write a title for the review. The preferred titles are under fifteen words.
Input: I just set this up today, so I will update this review if needs be as time goes on.<br /><br />I am using it on a new Retina 15 inch Macbook Pro purchased 09/12 and running OSX 10.8.2<br /><br />I am using four 3TB Seagate hard drives purchased here: http://www.amazon.com/gp/product/B005T3GRLY/ref=oh_details_o01_s00_i00<br /><br />The installation went smoothly and was very quick and painless. I set it up as RAID 5, and the MBP immediately recognized it as a 9TB drive and asked if I wanted to initialize it. I formatted it as Mac OS Extended (Journaled) and it is showing up and behaving like any other external hdd.<br /><br />I have tested data transfer to it with both USB 2.0 and USB 3.0, and both work as expected. It is able to take advantage of the USB 3.0 speed quite nicely and I am currently transferring 150GB in about 20 mins. I mention this specifically because there have been issues in the past with other Mediasonic 4-bay enclosures being able to work properly with Mac's implementation of USB 3.0. This seems to work without any issues.<br /><br />I haven't had a chance to test the sleep feature on it, but will update when I have the chance.<br /><br />The Mediasonic works as expected in regards to plugging and unplugging; I can eject the disk in finder, unplug it, and it will quickly turn itself off. I can then plug it back in and it will turn itself back on and initialize back in finder. I mention this because I have other external hard drive enclosures that have a very strange and specific order that they need to be switched on, plugged in, ejected, unplugged, turned off, ect. and will cause problems if the 'recipe' isnt followed. This Mediasonic works nicely like any normal self-contained external hard drive.<br /><br />I won't go into the form factor/lights/sounds/etc, as other reviews have already done well in that regard, I just wanted to give a review specifically for other mac users. Feel free to comment if there is something on which you would like to specifically check or elaborate.

For Mac users: So far so great on new Retina Macbook Pro