OWC ThunderBay IV

Albert Filice
10 July, 2014
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Other World Computing ThunderBay IV

Other World Computing, www.macsales.com


Two Thunderbolt ports for daisy chaining


Additional adapter required for 2.5in drives

US$997.99 + shipping


A solid and versatile desktop storage solution

Multi-bay storage enclosures are versatile; you can reconfigure them for speed or redundancy depending on your needs. The ThunderBay IV from OWC has four drives that can be swapped easily with the aid of a screwdriver. You can configure the disks independently or as a RAID with the help of Disk Utility. The ThunderBay IV’s simple design and consistent performance make it an attractive desktop storage device.

While the drive case is black like the late 2013 Mac Pro, the perforated metal front panel is reminiscent of legacy Mac Pros. The front panel has to be unlocked with a key to access the individual drives, and the key acts as a handle for pulling the front panel off the drive.

Status lights for power and drive activity are visible through the front panel. A large fan in the back of the drive pulls air through the perforated front panel and expels it out the rear. Below the fan are two Thunderbolt ports for daisy chaining, a Kensington lock slot and power switch.

The drives (our unit came with 3.5in Toshiba DT01ACA300 mechanisms) are mounted on caddies with four screws, so you need a screwdriver to swap out the drives. In order to use any 2.5in drives in the 3.5in brackets you need to use a NewerTech AdaptaDrive converter bracket.

I tried using a standard 2.5in to 3.5in adapter that comes with most SSDs, but the SATA connections on both the adapter and the ThunderBay IV didn’t quite match up. Four of these adapters cost upwards of $60 total, something to keep in mind if you’re looking to buy the ThunderBay IV unpopulated, or want to mix and match drive sizes.

OWC's ThunderBay IV

Drives slide out the enclosure easily, but you need a screwdriver to get them out of the caddies.

With four drives, you can take your pick of software RAID configurations: 0, 1, 10 or JBOD. As a RAID 0 setup, the ThunderBay IV performs quite nicely. It can keep up with more expensive multi-bay drives like Promise’s Pegasus R6 and LaCie’s 5big Thunderbolt Series.

 ThunderBay IV Drive Adapter Brackets

You need adapter brackets to use 2.5in drives in the ThunderBay IV.

RAID 10 gives you data redundancy with a speed boost by creating a RAID 0 from two RAID 1 sets. We tested the drive under a RAID 10, and the speeds were about twice as fast as if the disks were managed independently. Keep in mind that, much like a RAID 1 configuration, RAID 10 limits you to half your total storage capacity.

Bottom line

OWC’s ThunderBay IV delivers impressive performance at a much lower price point than much of the competition. This makes it a great choice for professionals who want large storage capacities without having to forfeit speed.




2 people were compelled to have their say. We encourage you to do the same..

  1. Rod says:

    Is that it? This drive looks nice, it has some ports on it and can be configured using Disk Utility. What about some speed testing to back up the, “it can keep up with more expensive multi-bay drives like Promise’s Pegasus R6 and LaCie’s 5big Thunderbolt Series” remark.

    As a consumer and Mac enthusiast, I am researching the evolving storage options sporting the Thunderbolt technology so I can gauge the competition. I’ve looked at the Thunderbay as a very viable option to rival the Pegasus, Lacie and Caldigit drives to name a few. The OWC website only provides two reviews which enter into speed tests on the device which is about the only two I can retrieve on an Internet search.

    Why don’t you guys put it through it’s paces and give us the stats about it’s speed as you see it rather than have a general review which I could’ve completed after reading a product spec sheet. These results can vary widely between devices and can have a big influence on a consumers decision to buy.

    Personally I found this review severely lacking, not in the Macworld standard and was left disappointed still not having any real clear speed comparison with drive configuration and brand comparison.

    Come on Macworld, you can do better!

  2. Macworld Australia Staff says:

    Hi Rod,

    The results of the speed testing were missed when the article was published. It has been corrected.


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