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We're sorry, but this item is no longer for sale. However, there may be more External Drives and Enclosures items available.

We recommend OWC Mercury Elite Pro Dual-Drive RAID Enclosure Kit with FireWire 800 & USB 3.0 Interfaces (Mfr P/N: MED3FH0GB) from Other World Computing for $99.00 as a suitable alternative.

OWC Mercury Elite Pro RAID

0GB Multi-Interface Performance RAID

Mac / PC / USB 2.0 & 1.1 / FireWire 800 / FireWire 400 / eSATA
  • Mac
  • PC
  • eSATA
  • FireWire 800/400
  • USB
"Add Your Own SATA Hard Drives"
When you want high style in high performance storage, look no further than the Mercury Elite Pro Dual-Bay . With the highest quality chipset and drive mechanisms built into a shock resistant portable aluminum enclosure, the Mercury Elite Pro Dual-Bay is ready to go wherever you need an A/V, Digital Photography, Professional Music, Graphics, General Data, and Time Machine ready storage solution.
  • Supports two 3.5" SATA hard disk drives
  • RAID Support: RAID 0, 1, SPAN & Independent Mode*
  • Up to 64MB data buffer
  • Up to 10,000RPM speeds
  • Oxford 946 chipset
  • Cool Blue drive activity indicator LED
  • Super quiet operation
  • Shock resistant aluminum enclosure
  • All connector cables included
Professional Grade Plug and Play Data Storage/Backup Performance with Superior Convenience and Reliability
With two 3.5" Serial ATA (1.5Gb/s, 3.0Gb/s, and 6.0Gb/s) hard drives offering massive storage capacity with up to 4TB per bay (4.0TB x 2), the latest Oxford chipset, and a Multi-Interface of FireWire 800/FireWire 400/ USB 2.0/eSATA connectivity, the Mercury Elite Pro Dual-Bay Multi-Interface Performance RAID Solution delivers up to 300MB/s data transfer speeds for demanding data storage and backup needs.
Hard Drive Not Included - Needs 3.5" Serial ATA (SATA) Hard Drive
3.5" sata hard drive
OWC Note: OWC recommends that all drives used in RAID configurations be identical for best performance. For recommended hard drives, please click on the product specs tab below. Please make sure that the drives you wish to use with this enclosure are compatible. If you need an enclosure for an ATA/IDE hard drive, click here.

*Unit will arrive pre-configured for RAID 0
From day one, the OWC Mercury Elite Series has been designed to be everything you'd hope for and more!


  • External OWC Mercury Elite Pro Dual Bay Hard Drive
  • 36" High Quality Double Shielded eSATA connecting cable (eSATA - eSATA)
  • 36" High Quality Double Shielded FireWire 800 connecting cable (9-9 Pin cable)
  • 36" High Quality Double Shielded FireWire 400 connecting cable (6-6 Pin cable)
  • 36" High Quality Double Shielded USB 2.0/1.1 connecting cable
  • UL Listed U.S./International Auto Switching 100 ~ 240v, 50/60Hz input, 12 Volt 5 Amp output Power Supply (adapter plugs for International use sold separately). For replacement power supply, click here.
  • Mercury Elite Pro Dual-Drive Multi-Interface Assembly Manual (7.2MB PDF)
  • OWC 1 Year Solution Warranty with 48-Hour Turnaround Time


Product Specifications:


  • Custom Oxford 946 eSATA / FW800 (1394B) / FW400(1394A) and USB 2.0 (1.1 Backwards compatible) Chipset

Supported Drive Type

  • Supports Two 3.5" Serial ATA Drives (1.5Gb/s, 3.0Gb/s, and 6.0Gb/s)

Drive Speed Support

  • Up to 10,000RPM

Recommended configurations supported

  • RAID 0 Performance Striping for maximum performance (requires two identical Hard Drives)
  • Non-RAID Span mode combines the capacity of two drives of the same size without any RAID data distribution scheme into one logical volume. Will also combine the capacity of varying size drives based on the lowest capacity drive in the set.
  • Non-RAID Independent Mode allows each drive to be accessed separately (Not available when utilizing eSATA interface)
  • RAID 1 also supported, but we strongly recommend the NewerTech Guardian MAXimus for maximum RAID 1 performance requirements.

Interfaces Supported

  • FireWire 800 (1394B)
  • FireWire 400 (1394A)
  • USB 2.0 (1.1 Backwards compatible)

Port Configuration

  • eSATA - 1 port
  • FireWire 800 - (2) 9 pin ports
  • FireWire 400 - (1) 6 pin port
  • USB 2.0/1.1 - (1) 5 pin port

Max Data Transfer Rate

  • eSATA - 3.0 Gbit/s (or 300 MB/sec)
  • FireWire 800 - 800Mbps (or 100MB/sec)
  • FireWire 400 - 400Mbps (or 50MB/sec)
  • USB 2.0 - 480Mbps (or 60MB/sec)
  • USB 1.1 - 12Mbps (or 1.5MB/sec)

Port/Interface Bootability

    Can I use this solution as an external startup drive?
  • eSATA: Supported on Macs and PC's meeting minimum requirements. - Click for more info
  • FireWire 800: Supported on Macs and PC's meeting minimum requirements. - Click for more info
  • FireWire 400: Supported on Macs and PC's meeting minimum requirements. - Click for more info
  • USB 2.0: Supported on Macs and PC's meeting minimum requirements. - Click for more info

Macintosh System Requirements

  • Mac OS 8.6 to 9.2.2 and an available USB 1.1 or FireWire 400 port.
  • Mac OS X 10.2.8 or later. Including 'Mavericks' 10.9.x and an available USB2.0/1.1, FireWire 800/400 port, or eSATA port.
  • Time Machine® Compatible: Mac OS X 10.5 (version introduced) and later.

Windows System Requirements

  • Windows 98SE or later and an available FireWire 400 or USB 2.0/1.1 port.
  • Windows 2000 or later and an available USB 2.0/1.1, FireWire 800/400, or eSATA port.

Linux Requirements

  • Linux compatible via supported USB and FireWire interfaces.

Power Supply

External Case Dimensions

  • 2.9 in (W) x 9 in (D) x 5.3 in (H) (73mm x 229mm x 134mm)

Drive Weight (no accessories)

  • Approximately 2.3 pounds (1.03kg) bare enclosure only

Operating Environment:


  • Dependent on mechanism installed

Relative Humidity

  • Dependent on mechanism installed


  • Dependent on mechanism installed

MTBF (hours)

  • Dependent on mechanism installed


Manufacturer provided specifications for Other World Computing p/n OWCMEPQ946QL2 UPC#: 736211771858

Customer Ratings

Write a Review 5 / 5 5 out of 5 (100%) reviewers would recommend this product
Verified Buyer
Reviewer: Anonymous Location: Oakville, ON Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Good enclosure June 19, 2013 Installing the drives was straightforward except that removing the inner chassis from the out housing required more force than expected. Don't forget to change the jumpers if you want JBOD mode.

Drives were recognized as un-initialized the first time connected to my Mac. Be careful, easy to tip over the unit.

Very quiet operation. Blue activity LED is quite intense--a bit much for my HTPC application. Need to disassemble and do something about it.

Overall, very satisfied but waiting to see how it holds up over the longer term.

I would recommend this item to a friend!

Verified Buyer
Reviewer: jdr2
Rating: 5/5 Good match... September 8, 2012 ..for my two 2TB drives. I searched and searched and do not know why I did not locate this enclosure sooner. It was the only one that had all of the features I needed at an affordable price. I've had my two 2TB Samsung drives in separate enclosures attached to a 2007 Mac Mini for approx two years now so it was nice to finally be able to store them in one attractive enclosure. Although I do not need to use any of the RAID options at the moment, it is nice to know they are available. The only two issues I have with it are: 1) fan noise and 2) when connected via firewire, the drives do not spin down when the Mac goes to sleep. Fortunately, this is not the case with USB. I am unable to test other computers but I've been through enough enclosures to know that it is probably not fault of the Mini . Whenever the new Minis arrive, I will soon be able to test it over firewire 800.

I would recommend this item to a friend!

Verified Buyer
Reviewer: TheHandyGeek
Rating: 5/5 Just what I needed May 25, 2012 I was looking for a way to host my iTunes video library through a Mac Mini server. I wanted something that provided RAID 1 for data integrity and has fast FireWire connection. This product provided all of that. The setup was easy with only a tweak of the dip switches. The drives are chugging away with issue! The only draw back is the fan is a little loud. Not a huge issue for me as the equipment is in my basement.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Silver Age: 35-44 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 I've tried everything... this one beats them all April 25, 2012 The OWC Mercury Elite Pro Dual-Drive RAID Enclosure has finally come to the rescue of providing a large capacity mirrored RAID at an exceptional price. With the 946 Oxford Chipset I have installed my own two Seagate Barracuda XT 4TB Hard Drives. Effectively 8TB of space but I have it running in a mirrored profile. It simply appears as a 4TB drive on my Mac. I have tried many storage systems, including ready set-up RAID and NAS systems from the top two heavy-weight HD manufacturers. While they produce exceptional drives (e.g. my Barracuda's), I have always disliked all the software and inflexibility with their operation. The Mercury Elite Pro is a solid hardware (as opposed to software) RAID that can be adjusted to other RAID options at the flick of a switch (note that your data most likely needs to be reloaded if you change the RAID configuration). The Mercury Elite Pro also gives you the option of running separate drives so when the day comes and you can't find a close twin hard drive to run you still have the options to run the RAID with two stand alone (different) drives.

For speed, I am running the RAID through Firewire 800 (1394b) to a MacMini Server (2011). Transferring data seems reasonably quick. It is certainly as quick, if not the quickest, of any other Firewire drive controllers I have used. I have no problem watching HD video files on the RAID while still transferring data as well (although I wouldn't recommend that as a standard process). I am not even really sure of the exact speed as the transfers of large files don't seem to bother me on this system. I can move 50-100 GB of say movie files and come back after a cup of coffee and they have either transferred or on the home straight. My initial transfer of over 2TB occurred in a couple of hours I recall with no problems. I recall the same on a Seagate GoFlex Firewire took considerably longer (with crashes as well)

My only downer on the Elite Mercury Pro is that while the fan/exhaust system is very efficient, it draws cool air through the front and expels the warm air out the back. This is great, but it does mean there is a low level "air-being-drawn-through-the-front-panel" sound. I am used to MacBook Air's and MacMini's with SSDs so the old fan sound of yesteryear is almost new to me now. That said, the fan sound is not at all loud and is not a reason not to buy the enclosure. And as I said it is very efficient at cooling the monster 4TBs. Yes I know you're saying you can't have your cake and eat it bla bla. I just wonder if a tweak on the enclosure could be to have a more open vent on the front under-side of the enclosure, eliminating the need for air to be drawn through the front mesh. That said, such a tweak may not cool the drives "so don't try that at home kids".

I note also another downer is the lack of USB3, but hey... I have Macs so I done need to worry about that. We have Thunderbolt... just nothing to connect to it... To be fair, OWC does have everything that is currently available for Thunderbolt. But the available peripherals still have to long long way to go before it is reasonably priced and available on more devices. I just hope it is not the Betamax of the video world.

In short, the OWC Mercury Elite Pro Dual-Drive RAID Enclosure is a really sexy, yet highly workable machine. Options galore in a simple configuration. If you buy the enclosure only as I did, the set up is incredibly simple. It also goes hand-in-hand aesthetically with the aluminium look of the MacMini (and I am guessing any other Mac).

I should also note that I bought the product on a Friday and it was delivered on Monday. Not bad for USPS I hear you say... except I live in Australia. Yes... It was delivered from the US to Australia (my door step) in about 70 hours. Via FedEx I might mention.


Happy customer.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Edx0r Age: 35-44 Experience Level: IT Professional Owned Product: less than a month
Rating: 5/5 Very Useful April 22, 2011 Excellent unit, especially for Mac Mini/iMac users who cannot expand their external storage easily.

That said, two caveats: don't rely on the manual that comes shipped with the unit if you plan on installing hard disks that already have data on them; the online version of the manual has updated dip switch settings that are quite different from the settings shown in the shipped manual. If you aren't careful, you'll find yourself getting a crash course in testdisk/pdisk to recover missing HFS partitions. Also, watch out for clearance between the cables for the top drive and the fan. They can easily obstruct it and prevent it from spinning. Otherwise, great purchase!

I would recommend this item to a friend!

OWC 0GB OWC Mercury Elite Pro Performance RAID Mfr P/N: OWCMEPQ946QL2 OWC SKU: OWCMEPQ946QL2 Multi-Interface Storage Solution 1 Year Warranty
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