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Question: How big TB for support? my disk is 4TB
Document: This unit runs very fast, is reliable, & performed flawlessly. My only dislikes are the slightly larger footprint on quite busy desktops &  it only accommodates a single HDD, not two. The larger capacity HDDs of today negate this somewhat. However, many individuals use these units to copy one disk to another for backup or HDD replacement on a desktop PC. It is a personal choice. This unit's speed makes up for these short comings & it is compatible with the new 4TB HDDs.
I have 10 hard drives that I can use as external storage without having to buy all the fancy cases and connectors. The hard disk connector are set to make the drives pop in and out easily.
It support for bot USB 2.0 and 3.0, and it works for my computer perfectly.No additional driver is required
After upgrading my harddrive, I needed to use my old one as a backup disk. This cradle fits your SATA harddrive easily, and turns it into a external disk. It comes both with USB and eSATA cable. eSATA works great with its fast transfer rate. If you have a blue USB 3.0 port on your computer this will also achieve fast speeds.
My search for an external hard disk drive dock with eSATA found this.The pros:+ Pretty good customer product reviews.+ The shipping was free when I purchased mine.+ Comes with a USB 3.0 cable.+ Comes with a eSATA cable.+ Backwards compatible with USB 1.1 & USB 2.0.+ Blue power LED, which changes to red to show disk activity.The cons:- On the expensive side.
The ORICO 6518US3 was recognized by my computer but did not recognize the new hard disk that I inserted in it. To make sure the disk was not at fault I directly connected the drive with a sata connector inside the computer and it the disk drive worked fine. You cannot easily tell when the drive is firmly connected with the sata/power connector because of the design of the device. Its possible I got a defective piece so take this review may not be representative of the product quality.
I like the looks, but the design is flawed. A fan should have been mounted on the bottom with intake ducts because the drive overheats big time. Had to wait till the drive cooled down before removing it. The heat dissipation design is a joke. Mounted an external fan the next time and it worked well.
If you have a ton of HDD's this is an invaluable tool. However, almost all my HDD's are 2.5&#34; so all I need are 2.5&#34; enclosures and SATA-USB connections. Ended up returning because I only have one or two 3.5&#34; HDD's and won't ever use this. It is a pretty big and heavy dock to keep around for once and a while use.
In essence, this device is identical to the PLUGABLE USB 3.0 Docking Station with an additional eSATA port. With the exception of the latter and labeling, everything is the same. Here are the advantages and disadvantages of this device...ADVANTAGES.1. The plastic body is well constructed with thick plastic..2. It handles SATA hard drives up to 4TB..3. The USB 3.0 cable is thick and shielded.
Thinking the drivers were outdated, we downloaded the latest drivers from the JMicron website. This corrected the problem & the eSATA is functional.Closing thoughts:&#9642; Way too much trouble to get the eSATA to work. If we had USB 3.0 on our computer, We'd use that & not mess with eSATA!&#9642; When using our Western Digital black 1 TB drive in this dock, it gets hot, over 106F!
Answer: I have not tried it with a 4TB, only a 3TB, but it works fine with that. Orico's site says it is compatible with all SATA III Hard drives, so I suspect that it would work fine with a 4TB. I believe that Amazon would let you return it if it is not compatible. The OS may limit your partition(s) size, but that would be true even if installed internally in your system.