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    Home » External Drives and Enclosures

    OWC Mercury
    On-The-Go®

    0GB
    Bus-Powered, Multi-Interface Enclosure Kit

    Mac / PC / USB 3.0 & 2.0 / FireWire 800 (FireWire 400 Backwards Compatible)
    • Mac
    • PC
    • FireWire 800/400
    • USB 3.0
    The OWC Mercury On-The-Go USB 3.0 & 2.0 / FireWire 800 (FireWire 400 Backwards Compatible) Enclosure Kit packs an incredible punch into a 3″ W x 5.5″ L x 1″ H 11 ounce package!
    If you're looking for one of the most compatible mass storage solutions made, look no further! The OWC Mercury On-The-Go drive is all you'll need! Packing a one-two punch of super fast USB 3.0 and FireWire 800, the OWC Mercury On-The-Go has what it takes to truly work cross platform.
    Outstanding Features
    The OWC Mercury On-The-Go features the latest in performance with an Oxford combination FireWire and USB chipset creating one perfectly integrated storage solution.

    The OWC Mercury On-The-Go's fanless design offers near silent operation while still keeping your drive cool. The built-in aluminum heatsink underneath the drive and passthrough cooling vents on the top of the case work in tandem to provide optimum results.

    The On-The-Go "Add your own Drive" Kit enclosure is ready to accept your own 2.5" SATA Hard Drive or SSD. Now you can upgrade your Mac or PC notebook's internal drive and retask that old drive as a new external drive for even more backup and storage capacity! This solution will give you an excellent transportable storage device, or a backup option that you may have not had!
     Drive Not Included – Needs 2.5" Serial ATA (SATA) Hard Drive or Solid State Drive
    2.5" sata hard drive
    OWC NOTE: This drive enclosure requires a 2.5" Serial ATA (SATA) drive mechanism.
    OWC Mercury On-The-Go
    • Gallery
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    • Gallery Pic 1
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    If your OWC or NewerTech brand product should require service during the warranty coverage period, we are committed to delivering the fastest possible service.


    Upon receipt of your unit, OWC will make every attempt to service it and arrange shipping back to you all within 48 weekday (Monday-Friday) business hours, excluding U.S. national holidays. This warranty service timeframe does not include data recovery attempts, out of stock items/components, or upgrade/product replacements.


    Read additional information.

    OWC's A Closer Look

    Take a closer look at
    OWC's On-The-Go Pro.
    OWC's Step-by-Step Install Video

    How to install a Hard Drive in a
    Mercury On-The-Go Enclosure.

    Includes

    Mercury On-The-Go includes
    • OWC Mercury On-The-Go Pro Bus-Powered, Multi-Interface, USB 3.0 & 2.0 / FireWire 800 (FireWire 400 Backwards Compatible) Enclosure Kit for SATA 2.5" Hard Drives
    • 15" High Quality Double Shielded FireWire 800 connecting cable (9-9 Pin cable)
    • 18" High Quality Double Shielded USB 3.0/2.0/1.1 (9 pin mini A – B) certified connecting cable
    • Carrying Case
    • Assembly Manual & User Guide
    • 1 Year OWC Enclosure Limited Warranty with 48-Hour Turnaround Time

    Gallery

    Gallery Pic 1 Gallery Pic 2 Gallery Pic 3

    Product Specifications:

    Bus Interface

    • FireWire 1394B (IEE1394A/B/iLink Compliant), 2 9 Pin (powered) ports, backwards compatible with FireWire 400 (9-Pin to 6-Pin Cable) – requires FireWire 800 to 400 Cable/Adapter for use with 1394A Interface, see related items.
    • USB 3.0 / 2.0 / 1.1 Backwards compatible 9 pin mini "B" port.

    Cables

    • All cables included. The USB cable connects to systems with USB, USB 2.0, and USB 3.0. No additional USB cable is needed to connect the drive.

    Chipset

    • Oxford 944 and ASMedia 1051e FireWire/USB chipset

    Drive Mechanisms Supported

    Max Data Transfer Rate

    • FireWire 800 – 100MB/sec
    • FireWire 400 – 50MB/sec
    • USB 3.0 – 500MB/sec
    • USB 2.0 – 60MB/sec
    • USB 1.1 – 1.5MB/sec

    Macintosh System Requirements

    • Mac OS 8.6 to 9.2.2 compatible, OS X 10.1.x and later. (10.2 or later required for FW800 and USB 3.0)
    • FireWire 800: Macintosh with FireWire 800 interface, either built in or via PCI FireWire 800 card.
    • FireWire 400: Macintosh with FireWire 400 interface, either built in or via PCI FireWire 400 card.
    • USB 3.0: Macintosh with USB 3.0 interface, either built in or via PCI USB 3.0 card.
    • USB 2.0: Macintosh with USB 2.0 interface, either built in or via PCI USB 2.0 card.

    UASP (USB Attached SCSI Protocol) Compliant

    • Yes

    Port/Interface Bootability

    • Can I use this solution as an external startup drive?
    • 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 3.0: 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

    Windows System Requirements

    • FireWire 800: PC with FireWire 800 interface, either built in or via PCI FireWire 800 card.
    • FireWire 400: PC with FireWire 400 interface, either built in or via PCI FireWire 400 card.
    • USB 3.0: PC with USB 3.0 interface, either built in or via PCI USB 3.0 card.
    • USB 2.0: PC with USB 2.0 interface, either built in or via PCI USB 2.0 card.

    Linux Requirements

    • Linux compatible via supported USB and FireWire interfaces.

    Related Items

    Power Supply*

    • Bus Power via FireWire 800 supported on all models equipped with an available FireWire 800 port either factory stock or via add on FireWire 800 PCI Card.
    • Bus Power via FireWire 400 on all models made in 2001 or later via Factory ports or any model with add on FireWire 400 PCI Card.
    • Bus power via USB on most computers with factory installed USB 2.0 or USB 3.0 port.
    • Optional AC Adapter* (available as a separate purchase here)
      * AC adapter not required for most applications provided computer bus supplies appropriate power needs.

    External Case Dimensions

    • 3.5" (W) x 5.5" (D) x 1" (H)
    • 88.9mm x 139.7mm x 25.4mm

    Unit Weight (no mechanism)

    • 0.44lbs. (0.19kg)

    Product Manual

    Operating Environment:

    Temperature

    • Dependent on mechanism installed

    Relative Humidity

    • Dependent on mechanism installed

    Vibration

    • Dependent on mechanism installed

    MTBF (hours)

    • Dependent on mechanism installed

    Warranty

    1 Year OWC Enclosure Limited Warranty

    The best warranty is one you never have to use, but should the need occur – OWC is proud to provide a superior level of support and warranty coverage to our customers. Even when not used, we understand the peace of mind afforded by a longer warranty period. OWC's industry leading coverage is a testament to our confidence in the reliability of the solutions that we offer. OWC solutions are engineered to demanding quality standards in order to deliver the most reliable, highest performance available on the market in each storage category.

    View more information about the 1 Year OWC Enclosure Limited Warranty
    Manufacturer provided specifications for Other World Computing p/n MSTG800U3K UPC#: 736211773258

    Reviews/Awards

    Customer Ratings

    Write a Review 4.8 / 5 191 out of 205 (93%) reviewers would recommend this product
    1 2 3 4
    Verified Buyer
    Reviewer: awebdancer Location: Seattle Age: Over 65 Experience Level: Hobbiest Owned Product: less than a month
    Rating: 5/5 Go Pro Hard Drive July 1, 2018 The Go Pro Hard Drive was very, very easy to install. I have an older mac and all the hard drives I looked at required a current OS system. I had attempted to install a Seagate that was made for my older mac and had to take my mac to an apple store, because the drive messed up my mac big time. The Go Pro was pretty much plug in - install the hardware, ask the time machine to set it up and it was good to Go!

    I am very pleased.

    I would recommend this item to a friend! This review is from 2.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 5400RPM Storage Solution. Customer Videos:

    Verified Buyer
    Reviewer: Cricketphan Location: Hendersonville, NC Age: Over 65 Experience Level: Home User Owned Product: 1-3 months
    Rating: 5/5 Compact & Fast June 21, 2018 This is our 2nd On-The-Go Mercury drive from OWC (1st one ran out of space) and we couldn't be more pleased. Connection to our 2010 MacBook Pro was seamless, and the backup speed is outstanding. Truly plug and "play". THANKYOU, OWC!!

    I would recommend this item to a friend! This review is from 1.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 7200RPM Storage Solution. Customer Videos:

    Verified Buyer
    Reviewer: KlownGuy Location: Portland, ME Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
    Rating: 5/5 Second one April 26, 2018 This is the second one of these that I have purchased. Although my first one that I bought in 2011 was 500GB and it still works, I needed some more space. This one is the SSD version. I hope it lasts like the first one!

    I would recommend this item to a friend! This review is from 250GB SSD OWC Mercury On-The-Go FireWire 800 / 400+USB3 SSD Portable Bus Powered Solution.. Customer Videos:

    Verified Buyer
    Reviewer: TheEudoraGuy Location: San Diego, CA Age: 55-65 Experience Level: IT Professional Owned Product: 1-3 months
    Rating: 5/5 It's always the same April 2, 2018 Excellent products, stellar service. OWC never changes.

    I would recommend this item to a friend! This review is from 2.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 5400RPM Storage Solution. Customer Videos:

    Verified Buyer
    Reviewer: Josh12 Location: Josh12 Age: 35-44 Experience Level: Home User Owned Product: 1-3 months
    Rating: 5/5 Drive enclosure kit February 22, 2018 Very easy to install an SSD or HDD.

    I would recommend this item to a friend! This review is from (*) OWC Mercury On-The-Go 2.5" Portable FW800 + USB 3.0/2.0 Drive Enclosure Kit. Customer Videos:

    Verified Buyer
    Reviewer: Mike3334 Location: Northampton MA Age: Over 65 Experience Level: Home User Owned Product: less than a month
    Rating: 5/5 Just what I needed January 22, 2018 This little portable hard drive was just what I needed, easy to set up and exactly as described. Another good experience

    I would recommend this item to a friend! This review is from 1.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 7200RPM Storage Solution. Customer Videos:

    Verified Buyer Top 250 Contributor
    Reviewer: DougB Location: AZ Age: Over 65 Experience Level: Home User Owned Product: 1-3 months
    Rating: 5/5 Fast and Dependable December 8, 2017 This drive is plenty fast enough for my purposes, as is FireWire 800. I've found FireWire 400 & 800 connectors to be very reliable, while USB has been comparatively finicky, now and then disastrously so. This package is a bit like a two-speed drive, first gear so you're sure to get there promptly no matter what, and second when top speed is the priority. My iMovie and Aperture working libraries are on this drive, and unlike on a USB3 thumbdrive that proved glacial, this Mercury kit on lowly FireWire creates no delays in working the programs. The enclosure isn't glamorous, but it nicely gets the job done, especially since this 5400 RPM drive needs no separate power supply.

    I would recommend this item to a friend! This review is from 2.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 5400RPM Storage Solution. Customer Videos:

    Verified Buyer
    Reviewer: ADAV Location: Toulouse, France Age: Over 65 Experience Level: Home User Owned Product: less than a month
    Rating: 5/5 Handy and good looking October 30, 2017 Nice manufacturing quality, good looking and all working at he first time. Excellent

    I would recommend this item to a friend! Customer Videos:

    Verified Buyer
    Reviewer: MATT66 Location: Asia Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
    Rating: 2/5 The product not reusable friendly October 11, 2017 Bought the casing only and doing HDD self-installation. I have many different type of casing all this years and this is the only one i felt is not reusable friendly. Easy to install and the product was compact and nice but after you have pushed in the back plastic panel to complete the installation, it will be impossible to pull out again in future if you want to upgrade the HDD. Not recommended for someone if they want to swap the HDD often.

    This review is from (*) OWC Mercury On-The-Go 2.5" Portable FW800 + USB 3.0/2.0 Drive Enclosure Kit. Customer Videos:

    Response from MacSales.com, Call center October 23, 2017 The Mercury Elite Pro is designed for a single hard drive, and is not really meant to be swapped out regularly. The back panel can be removed, but it is not the easiest process. If using multiple drives with the same enclosure is a factor, we would recommend one of our docking stations, such as the Voyager Q.
    Verified Buyer
    Reviewer: diarma Location: Serbia | Europe Age: 55-65 Experience Level: IT Professional Owned Product: less than a month
    Rating: 5/5 5+ | Great features | great design | September 22, 2017 5+ | Great features | great design | - simply, all is perfect!

    I would recommend this item to a friend! Customer Videos:

    Verified Buyer
    Reviewer: Woodstock Location: Avon, IN Age: Over 65 Experience Level: Home User Owned Product: over 6 months
    Rating: 5/5 Never a problem May 2, 2017 I use my OWC Mercury On-The-Go Firewire portable drive to maintain backups of my 2009 MacBook Pro. No incidents at all to report and I'd not hesitate to buy the drive again...but I don't need to!

    I would recommend this item to a friend! This review is from 1.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 5400RPM Storage Solution. Customer Videos:

    Verified Buyer
    Reviewer: Jedi Location: Vientiane, Laos Age: Over 65 Experience Level: IT Professional Owned Product: less than a month
    Rating: 4/5 for use both on older and newer Macs! February 6, 2017 I just pulled out the original 500GB HDD on my mid-2010 MacBook Pro 15" (USB 2.0 and FW800 ports only), installed an SSD instead, upped the RAM to the max 8GB, and put the old HDD into the Mercury box. Worth doing, and while I had earlier bought the upgrade hardware from another source, OWC/MacSales would be an excellent supplier as well. Most of the rest of my Mac workstations and field use hardware is USB 3, so I was willing to pay twice of what an HDD case that had only USB 3 ports would cost to effectively double or triple my data transfer rates —compared to USB2— on the old machine, using the the FW800 interface, and also getting full USB3 speed on all the other machines in the house. Very robust design and clearly an excellent product. But again, probably not worth is if you have USB3 ports on your Macs, since FW800 is otherwise obsolete and long abandoned by Apple.

    I would recommend this item to a friend! Customer Videos:

    Verified Buyer
    Reviewer: redram Location: Lithia FL Age: Over 65 Experience Level: Home User Owned Product: less than a month
    Rating: 5/5 excellent support January 17, 2017 after calling to address a case where the unit was making noise , Iwas well taking care of. problem. It appears to be low power from USB cable so I switched to firewire as directed by support. no problem since.

    I would recommend this item to a friend! This review is from 1.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 7200RPM Storage Solution. Customer Videos:

    Verified Buyer
    Reviewer: BubbaJ Location: Texas Age: Over 65 Experience Level: Power User Owned Product: 1-3 months
    Rating: 5/5 Great Product November 25, 2016 I got this drive to be used as a Time Machine backup drive for an older Mac Book Pro. No problems & runs great. I've hooked it up to the laptop using both USB & Firewire (cables came with it).

    I would recommend this item to a friend! This review is from 1.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 7200RPM Storage Solution. Customer Videos:

    Verified Buyer
    Reviewer: OldWorldComputing
    Rating: 4/5 you may need the AC adapter November 20, 2016 I have several of these drive enclosures. They're very handy for tossing in the laptop bag. I also use them for rotating off-site backups. My only complaint is that, with some drives, they may require more power than is provided by USB or Firewire, which means you have to carry one of the AC adapter wall-warts AND be near a power outlet. This reduces the portability considerably. This drawback is barely implied by a tiny footnote on the product page, and is more explicit in the documentation that comes with the product. I suggest you buy one of the AC adapters and keep it with the unit, at least until you're sure the drive works reliably without it.

    (I encountered the problem with HGST 1TB drives; some work without the AC adapter, some don't. Frustrating, especially until I figured out what the problem was.)

    I would recommend this item to a friend! Customer Videos:

    Verified Buyer
    Reviewer: Fdisk2k Location: Lima - Peru Age: 35-44 Experience Level: Power User Owned Product: less than a month
    Rating: 5/5 Perfect enclosure for backups November 8, 2016 Perfect enclosure for backups or transport your digital media. Purchased a bare kit, since I've already my hard drive, the kit comes with cables and a plastic pouch.

    I recommend this enclosure to do your backups always, don't wait until you are in big trouble.

    I would recommend this item to a friend! Customer Videos:

    Verified Buyer
    Reviewer: Macheretic Location: People's Democratic Socialist Republic of Illinois Age: 55-65 Experience Level: Home User Owned Product: 1-3 months
    Rating: 5/5 Solid drive, flexible, portable solution November 3, 2016 This is my primary on-site backup drive. All my OWC drives, SSD or otherwise, have been very reliable. I recommend them over any other brand except Apple—and they are generally less expensive than Apple branded products.

    I particularly like the drive enclosure. Very sturdy, well designed and made. The built in connection flexibility makes connection to almost anything easy, without adapters. The power switch is a nice touch, too.

    Only downsides to this package are the took kit, which is kind of chintzy, though the little pry tool is very handy for getting components out of a laptop. The carrying case is well made, but the inner partition (to separate cables and drive enclosure) is too floppy and unnecessary considering the near impervious drive enclosure.

    I would recommend this item to a friend! This review is from 1.0TB SSD OWC Mercury On-The-Go FireWire 800 / 400+USB3 SSD Portable Bus Powered Solution.. Customer Videos:

    Verified Buyer
    Reviewer: Anonymous Location: Michigan Age: Over 65 Experience Level: Home User Owned Product: 1-3 months
    Rating: 5/5 Excellent Product July 29, 2016 I have several of these OWC portable drives of varying storage capacity. All have performed flawlessly. I particularly like the variety of connectivity ports available in the several configurations. I have recommended these products to friends who have purchased and been equally satisfied.

    I would recommend this item to a friend! This review is from 1.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 7200RPM Storage Solution.

    Verified Buyer
    Reviewer: Anonymous Location: Sydney, Australia Age: 25-34 Experience Level: Home User Owned Product: less than a month
    Rating: 5/5 Attractive, good quality product! July 20, 2016 With a very simple assembly, this product is of great quality and has a cool appearance in transparent plastic. USB 3 and two Firewire ports make it very efficient and usable in the current age

    I would recommend this item to a friend!

    Verified Buyer
    Reviewer: Anonymous Location: Chana, Illinois Age: 55-65 Experience Level: Power User Owned Product: over 6 months
    Rating: 5/5 Great external boot drive! July 16, 2016 I added this external drive to my late 2009 iMac as the primary boot partition about a year ago. Utilizing the Firewire connection, the performance improvement over the internal conventional drive was very evident, and I have not had any problems with this drive.

    I would recommend this item to a friend! This review is from 500GB SSD OWC Mercury On-The-Go FireWire 800 / 400+USB3 SSD Portable Bus Powered Solution..

    Verified Buyer
    Reviewer: Anonymous Location: Atlanta, GA Age: Over 65 Experience Level: Power User
    Rating: 4/5 Exactly what I wanted July 3, 2016 Wanted a portable hard drive using bus power to be able to backup my MacBookPro

    I would recommend this item to a friend! This review is from 500GB OWC Mercury On-The-Go Portable FW800&400/USB3 7200RPM Bus Powered.

    Verified Buyer
    Reviewer: Anonymous Location: Irvington, NY Age: Over 65 Experience Level: Power User Owned Product: 3-4 months
    Rating: 5/5 Works great, looks great June 20, 2016 Durable, fast-fast-fast, external drive, Its rounded plastic case is practically bulletproof. I'm using it as backup for my photos and for my Photoshop and On1 caches.

    I would recommend this item to a friend! This review is from 1.0TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 7200RPM Storage Solution.

    Verified Buyer
    Reviewer: Anonymous Location: Maine Age: Over 65 Experience Level: Home User Owned Product: 1-3 months
    Rating: 4/5 Good product but cable too short June 13, 2016 This portable hard drive works well, efficiently , and quietly as part of my backup strategy. I trust OWC products from long experience with them.

    Unfortunately there is one disappointment. The FireWire connection cable that came with the hard drive is much too short to be truly useful. It is difficult to use it with my iMac and reach the drive sitting on my desk near the computer. OWC should provide a longer cable for this product.

    Other than that. it's a fine product.

    I would recommend this item to a friend! This review is from 500GB OWC Mercury On-The-Go Portable FW800&400/USB3 5400RPM Storage Solution.

    Verified Buyer
    Reviewer: Kier Location: Puyallup, WA Age: 45-54 Experience Level: Power User Owned Product: 3-4 months
    Rating: 5/5 Great drive! May 29, 2016 My goal with this drive is to keep my working photos on this drive so that I could move between editing on my MacPro at home and Mac Book Pro on the road and it works perfectly. I love the speed and it looks great and best of all it's bus powered so no extra power supply. You've got to get one of these!

    I would recommend this item to a friend! This review is from 250GB SSD OWC Mercury On-The-Go FireWire 800 / 400+USB3 SSD Portable Bus Powered Solution..

    Verified Buyer Top 250 Contributor
    Reviewer: Anonymous Location: New York City Age: 55-65 Experience Level: IT Professional Owned Product: over 6 months
    Rating: 5/5 My personal data bank May 28, 2016 Still saving my but across the years resurrecting old drives.

    I would recommend this item to a friend!

    OWC 0GB OWC On-The-Go® Mfr P/N: MSTG800U3K OWC SKU: OWCMSTG800U3K Bus-Powered, Multi-Interface Enclosure Kit 1 Year OWC Limited Warranty Ships: Same Day
    Reviews (205)
    only $59.99
    Add to CartOther World Computing MSTG800U3K In Stock, Click to Buy Now
    Additional Capacities & Kits: Add Your Own Drive
    • Enclosure
    w/ 5400 RPM HDD
    • 500GB
      • Ships: Same Day
      • Only $119.99
      • OWC Price $114.99
    • 1.0TB
      • Ships: Same Day
      • Only $129.99
      • OWC Price $129.99
    • 2.0TB
      • Ships: Same Day
      • Only $159.99
      • OWC Price $157.99
    w/ 7200 RPM HDD
    • 500GB
      • Ships: Same Day
      • Only $129.99
      • OWC Price $124.99
    • 1.0TB
      • Ships: Same Day
      • Only $139.99
      • OWC Price $134.99
    w/ SSD
    • 60GB
      • Ships: Same Day
      • Only $94.99
      • OWC Price $94.99
    • 120GB
      • Ships: Same Day
      • Only $109.99
      • OWC Price $104.99
    • 250GB
      • Ships: Same Day
      • Only $129.99
      • OWC Price $129.99
    • 500GB
      • Ships: Same Day
      • Only $194.99
      • OWC Price $194.99
    • 1.0TB
      • Ships: Same Day
      • Only $394.99
      • OWC Price $369.99
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    FireWire 800-400 Adapter FireWire 800-400 Adapter Provides a simple way to connect FireWire 400 devices to a FireWire 800 port From $7.00
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