Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Does this unit have a fan in it?
Document: I have learned the hard way to keep this kind of unit on the floor. If they tip over from high up, either they are damaged or the item of floor it lands on are damaged (mostly due to the weight of the hard drive). USB interface had no problem being recognized.
Good quality piece. I had a couple of old laptop drives that I had no idea what was on them. I got this unit, plugged it in, inserted an old drive, turned it on, & there it was showing up in my list of drives on my computer. Cool. Works great.
the over all unit is a good unit and works well when connection cable is connected but design of cable insert into unit was not thought out it keeps falling out slight movement of any cable in system connected to computer pulls it out of unit. i suggest you put lock on cable plug in so it will not fall out
However, for the price and purpose, I believe it's also acceptable.Update (11/14/2013): The unit I've bought is different from the one being offered now. The one I have looks exactly like the Plugable docking station (B003UI62AG), except for the black finishing.
This is a nice well-built unit that does the job. The only flaw I can see is that if there is no HDD inserted in the dock the plugs are basically uncovered facing upwards making them vulnerable to dust. I cover mine with the lid from a package of sandwich meat (ha!). Other than that, it is a good value for the money.
Great Product with good priceGood quality and works straight out of the box, plug and pay.Even if you need only 2.5 or 3.5 inch, it is better to have both formats in one unit. You may need to copy data from your old desktop drive or use the high capacity 4TB server disk.
I have a large CyberPC gaming tower computer which has the capacity to hold 7 hard drives. It's relatively easy to exchange hard drives but it can be tedious when you have so many hard drives. This little unit makes it easy to quickly see what is on my hard drives and to troubleshoot any issues without having to go through and pull out the hard drives from my tower over and over.
Has great Pros:1) Play and plug with my Windows 7 OS.2) USB 3.0 that is actually faster than 2.0.3) Comes with cable and power adapter4) Open air design to vent drive heat.5) About 25% cheaper price-wise than basically every other similar device out there.Very happy with the unit.
Unit looks fine just as pictured (except my power button was different). Powered on when plugged in, but when I inserted my HD the power turned off and pressing the button did nothing. I tried both hard drives (2TB) and it didn't work. Contacted Cable Matters support and they said it is defective...I wonder if it really is...I sent back for full refund and am disappointed.
Cheap POS, unit would not stay connected. Tried various usb ports and cables and drives. When the unit arrived the power button in back was broken off. I figured I wouldn't need to power if on/off that often so I tried to keep the unit until it didn't work. Ended up returning the unit for a refund. Save your time and money and DO NOT order this.
Answer: no fan