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    $70.99 off *NOW* Get Parallels Desktop Pro Edition - Windows/Multi OS Compatibility software for Mac - Only $29.00 with select OWC SSDs, HDDs, Memory, External Storage, and Optical Drives! (Limit 3 rebates, 1 rebate per qualifying item)
    Must purchase with: PPDPROSUB1Y-REB29

    OWC Mercury
    On-The-Go® Pro

    250GB SSD
    Bus-Powered, Multi-Interface Storage Solution

    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) Storage Solution provides maximum storage in an ultra-portable, totally bus powered design!
    Outstanding Features
    Built with the fastest and most reliable Solid State Drive on the market today. The Mercury Electra 6G SSD line features industry leading Technologies:
    Compact and Versatile
    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. The Mercury On-The-Go Pro is bus-powered, so it doesn't require an AC adapter!
    Cool and Silent
    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. 
    Fast and Reliable
    The OWC Mercury On-The-Go uses the latest Oxford and ASMedia chipset for both USB 3.0 and FireWire 800. Designed to work with SATA hard drives and SSDs, this chipset is the latest evolution for the best performance on the market.
    OWC Mercury On-The-Go SSD
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    48 Hour Service

    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.

    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) Storage Solution with SSD
    • 15" High Quality Double Shielded FireWire 800 connecting cable (9-9 Pin cable)
    • 16" High Quality Double Shielded USB 3.0/2.0/1.1 certified connecting cable
    • Carrying Case
    • Assembly Manual & User Guide

    Gallery

    Gallery Pic 1 Gallery Pic 2 Gallery Pic 3

    360 Gallery

    360 Gallery

    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.

    Interface (Chipset)

    • USB 3.1 gen 1 (ASMedia ASM1153E)
    • FireWire 800 (JMicron JMB355)

    Standard Mechanism

      Release Candidate (RC) firmware set

      There are two kinds of firmware for SSDs Mass Production (MP) and Release Candidate (RC). Prior to an MP firmware release, there are beta firmware releases and an RC firmware release. Often, the RC is the same as the MP release, however there can be small changes and bug fixes made between the two. OWC has evaluated the RC for the 6Gb/s SandForce 2281 Processor and found it to be stable with no issues reported during our testing. However, as with any evolutionary product, issues may surface as different usages and configurations are employed and it is important to understand that there will be further updates and revisions.

      Since no firmware update is currently offered for the OWC Mercury EXTREME Pro 6G SSD, no update page exists. To see the typical steps involved with a self performed field firmware update, please visit our 3Gb/s product update page at: http://eshop.macsales.com/Customized_Pages/Framework.cfm?page=sf_firmware.html

      It is important to note that the current firmware update tool requires the use of Windows XP/Vista/7. OWC is currently working on a Mac OS based update tool, but we do not have an exact availability date.

      250GB Mercury Electra 6G SSD Specifications:

      Specifications

      Controller
      4-Ch
      NAND
      Tier 1 3D NAND
      Form Factor
      Standard 7mm 2.5"
      Interface
      SATA 6Gb/s, 3Gb/s & 1.5Gb/s supported, SATA 3.0 Compliant
      Capacity 1
      250GB useable capacity
      RAID Support
      Yes
      SMART Attributes
      Standard 2
      Native Command Queuing
      up to 32 commands
      RoHS Compliant
      Yes
      Format
      Unformatted (Instructions on formatting here)

      Physical

      Height (max)
      7mm (0.276″)
      Width (max)
      70.06mm (2.758″)
      Length (max)
      100.12mm (3.941″)
      Weight
      77 grams +/- 2 grams
      0.170 lbs +/- 2.71 oz

      Reliability

      TRIM Support
      OS Dependent

      Performance

      Sequential Reads
      (Compressible Data)
      up to 522MB/s
      Sequential Writes
      (Compressible Data)
      up to 463MB/s
      Sequential Reads
      (Incompressible Data)
      up to 506MB/s
      Sequential Writes
      (Incompressible Data)
      up to 443MB/s
      Random 4K Read
      up to 90,000 IOPS
      Random 4K Write
      up to 60,000 IOPS

      Power

      Active
      2.1 W
      Idle
      0.9 W

      Environmental (Operating)

      Temperature (°F)
      32°F to 158°F
      Temperature (°C)
      0°C to 70°C

      Environmental (Non-Operating)

      Temperature (°F)
      -40°F to 185°F
      Temperature (°C)
      -40°C to 85°C
      1. 1GB = 1,000,000,000 bytes. Total accessible capacity varies depending upon operating environment (typically 5-10% less). The actual total capacity will depend on your own defined file settings/preferences. 
      2. Temperature reporting is currently an unsupported feature because due to the operating characteristics of SSDs, it is highly unlikely one would ever exceed an OWC Mercury SSD's stated operating temperature ceiling of 158F/70C. However, we are looking into supporting this feature in the future via a firmware update. Firmware updates can be found here: http://eshop.macsales.com/tech_center/OWC/SSD.
    • 250GB* OWC Mercury Electra™ 6G SSD**

    • *1GB = 1,000,000,000 bytes. Total accessible capacity varies depending upon operating environment (typically 5-10% less). The actual total capacity will depend on your own defined file settings/preferences.

      **OWC reserves the right to replace or upgrade to equivalent or better components.

    Drive Interface

    • SATA (Serial ATA)

    Port Configuration

    • FireWire 800 – (2) 9 pin powered ports
    • USB 3.0 – (1) 9 pin mini B port

    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

    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

    Format

    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.

    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

    Enclosure Weight (no accessories)

    • 0.61lbs. (0.27kg)

    User Guide

    Operating Environment:

    Temperature

    • (operating) 0°C – 70°C (32°F – 158°F)
    • (non-operating) -40°C – 85°C (-40°F – 185°F)

    Relative Humidity

    • (operating) 8% – 90% RH (Non-condensing)
    • (non-operating) 5% – 95% RH (Non-condensing)

    Shock

    • (operating) 1500G 0.5mS;
    • (non-operating) 1500G 0.5mS

    Vibration

    • (operating) 16G (16 – 1600Hz)
    • (non-operating) 16G (16 – 1600Hz)
    Manufacturer provided specifications for Other World Computing p/n MS8U3SSD240 UPC#: 794504763027

    Awards

    Customer Ratings

    Write a Review 4.8 / 5 200 out of 214 (93%) reviewers would recommend this product
    1 2 3 4
    Verified Buyer
    Reviewer: Anonymous Age: 55-65 Experience Level: IT Professional Owned Product: 1-3 months
    Rating: 5/5 Great Product September 15, 2014 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.
    Verified Buyer
    Reviewer: Anonymous Location: Burleigh Heads, QLD Australia Age: 35-44 Experience Level: IT Professional Owned Product: over 6 months
    Rating: 5/5 Best thing since sliced bread August 27, 2014 I have two of these, one formatted with OS X and the other NTFS. Great for high speed mobile data transfers. If you intend to use a 7200rpm drive that draws a bit of power, note that the drive may not always switch on over USB. Best to try another USB port or if connected to a desktop, always use the USB ports on the back of the tower as they can supply more power.

    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.

    Verified Buyer
    Reviewer: Anonymous Location: Guayaquil Age: 25-34 Experience Level: Power User Owned Product: 1-3 months
    Rating: 5/5 Great hard drive August 25, 2014 This is a good combination of storage capacity - spinning velocity - size - price. The only drawback I've found is that the firewire cable that comes with this unit is unreliable, it connects whenever it feels like it which is not most of the time, just replace that cable and you're good to go.

    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: Canyon Lake, TX Age: Over 65 Experience Level: Power User Owned Product: 1-3 months
    Rating: 5/5 Excellent speed for use with SSD's August 22, 2014 With its Firewire 800 speed this enclosure this enclosure complements the high speed of SSD's very nicely.

    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.

    Verified Buyer
    Reviewer: Anonymous Location: Vancouver Island Age: 45-54 Experience Level: Power User Owned Product: over 6 months
    Rating: 5/5 Excellent August 21, 2014 I have two of these firewire drives - one for a start-up - one cloned weekly from the start-up - a drive failure means all of two minutes down-time - this drive is perfect and fast....

    barry

    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: Modi'in, Israel Age: 45-54 Experience Level: Power User Owned Product: over 6 months
    Rating: 5/5 Really nice enclosure July 25, 2014 It's very practical as well as stylish. 2 Firewire ports allows you to daisy-chain. Has on on/off switch. The combo Firewire 800/USB 3 means you're guaranteed to get high performance no matter what Mac you're connecting to. (I have some 3+ year old Macs with USB 2.) Also, its transparency allows you to quickly identify exactly what drive it is. Plus it's cool looking. :)

    My only suggestion: It took me a while to figure out how to stick my SSD into the enclosure. The instructions were more for software installation and not hardware.

    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.

    Verified Buyer
    Reviewer: Anonymous Experience Level: IT Professional Owned Product: 1-3 months
    Rating: 5/5 Works Great June 29, 2014 I'm using this 120 GB Ext SSD FW800 on an iMac 20" Early '09. It was taking about 4 minutes to boot 10.8. I moved to 10.9 on this smaller drive, except for my iTunes and iPhoto libraries.It is now my preferred machine; over the mac bk pro, chrome bk, iPad 3. Responds nicely and is now a pleasure to use. Boot time might be under a minute. Made this old dog of a machine usable for the next few years at least! Customer sec helped to pick it out. They made it easy for me. Pricing is good also.

    This review is from 120GB SSD OWC Mercury On-The-Go FireWire 800 / 400+USB3 SSD Portable Bus Powered Solution..

    Verified Buyer Top 50 Contributor
    Reviewer: Anonymous Location: Austin, TX Age: 35-44 Experience Level: Power User Owned Product: over 6 months
    Rating: 4/5 works great June 23, 2014 bought this because i needed a bus-powered 7200rpm portable drive. works great in the field, i have used it to record multi-track audio and had no problems.

    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 Top 100 Contributor
    Reviewer: Anonymous Location: Elizabeth, NJ Age: 55-65 Experience Level: IT Professional Owned Product: less than a month
    Rating: 5/5 Worth the money June 22, 2014 I am a Mac addict. I use this drive to back up my iMac. I must own 5 or 6 of these drives that I have bought over the years to image everything from eMac to iMacs for school and home. They are compact, easy to use and have never given me any trouble. Everyone who sees these drives is impressed enough to buy one for themselves.

    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.

    Verified Buyer
    Reviewer: Anonymous Location: Oregon Age: Over 65 Experience Level: Home User Owned Product: 1-3 months
    Rating: 5/5 Unit assembles easily, works great May 30, 2014 The unit came with good instructions and plenty of the correct screws. Easy to install the SSD in the unit, and easy to put everything together.

    Works fine in my Mac Mini, and seems quite speedy using the provided FireWire 800 cable.

    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.

    Verified Buyer
    Reviewer: Anonymous Location: Vancouver, B.C. Age: 55-65 Experience Level: IT Professional Owned Product: less than a month
    Rating: 5/5 Stunning Performance May 15, 2014 top construction, easy to assemble, works perfectly, I love the USB 3.0 / Firewire 800 combination. It supports Firewire 800 daisy chaining.

    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.

    Verified Buyer
    Reviewer: Anonymous Location: Conyers, GA Age: Over 65 Experience Level: Home User Owned Product: 5-6 months
    Rating: 5/5 The 120GB SSD has great features like having both FireWire and USB connections. May 3, 2014 I was seeking an external drive I could put a lot on, but recall any small or large file quickly. The 120GB SSD matched my needs. Technical support offered by OWC was "right-on" it, in answering my questions. Really, what more could you ask for from the product or vendor?

    I would recommend this item to a friend! This review is from 120GB SSD OWC Mercury On-The-Go FireWire 800 / 400+USB3 SSD Portable Bus Powered Solution..

    Verified Buyer
    Reviewer: Anonymous Location: Boston Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
    Rating: 5/5 It works ! April 28, 2014 Put in an SSD drive, mounts right away on Snow Leopard, passes power to the bus powered Firewire interface (that's two bus powered devices on a 2009 MacBookPro). Extra bonus - didn't get too hot. Glad I got this, recommend !

    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.

    Verified Buyer
    Reviewer: Anonymous Location: Broken Arrow, OK Age: 35-44 Experience Level: Home User Owned Product: less than a month
    Rating: 5/5 Great Kit! January 11, 2014 This is a great little FW800 kit for any drive. Very fast and great protection for your hard drive. Highly recommend this to anyone with a spare drive! A superb deal at this price!

    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.

    Verified Buyer
    Reviewer: Anonymous Location: Brunei Age: 35-44 Experience Level: Home User Owned Product: 3-4 months
    Rating: 5/5 Best enclosure kit for 2.5" SATA HDD/SSD September 17, 2013 This product is one of the best purchase I've made and glad I made the right choice. Before I decided to get this product, I've done my homework searching around for a good all rounder enclosure kit for my Samsung 840 pro SSD. It is one of the few that have both the FireWire 800 & USB 3.0 ports. Been using it almost daily for the last 3 months and have not disappoint me once. With good built quality and excellent features and not to mention at a very affordable price, for me OWC have scored a perfect 10 with this product!!

    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.

    Verified Buyer
    Reviewer: Anonymous Location: Bay Area Age: Over 65 Experience Level: Power User Owned Product: less than a month
    Rating: 5/5 Outstanding products & service June 22, 2013 This is my second SSD from OWC. The first was an internal drive for a PPC PB G4 and the improvement in performance was significant. The online installation videos were also excellent. The second was an external SSD for backup for this same PB and, again, the quality of build and appearance are both first-rate. Of note, the first drive I purchased was the USB-only and wouldn't mount on my older PB because of inadequate power from the USB ports, so I went for the Firewire option and it works flawlessly. OWC handled the exchange efficiently and without hassle, and the replacement drive arrived in 2 days. This is an outstanding company to do business with as are their products.

    I would recommend this item to a friend! This review is from 120GB SSD OWC Mercury On-The-Go FireWire 800 / 400+USB3 SSD Portable Bus Powered Solution..

    Verified Buyer Top 50 Contributor
    Reviewer: joevt Location: Langley, B.C. Age: 35-44 Experience Level: Power User Owned Product: 1-3 months
    Rating: 5/5 Great performance from a portable drive February 26, 2013 I bought this (1.5 TB FW800+USB3) to replace my previous Mercury-on-The-Go drive (200 GB FW800+USB2) because I needed more space and speed.

    Current HDs (even non SSDs) are faster than FW800 can deliver so USB3, eSATA, or Thunderbolt is required for obtaining maximum speeds.

    I use the drive with a CalDigit FASTA-6GU3 card (that I purchased from OWC at the same time) in a 2008 Mac Pro. It gets up to 114 MB/s from USB3 and 67 MB/s from FW800 just as expected. I use the FW800 to connect to other Macs that don't have USB3. The drive is bus powered from either FW or USB. The USB3 of the CalDigit does not maintain connection during sleep so I would recommend not using sleep in that case.

    The drive comes with a nice carrying case (with room for cables) which will keep the drive looking shiny new.

    I chose this drive over the 2.0TB OWC Mercury Elite Pro mini Portable USB3.0 + eSATA even though the Elite Pro has more storage because the Elite Pro doesn't have FW for backward compatibility and the benchmarks indicated that the On-The-Go had faster USB3 speeds (though OWC is currently updating the benchmarks of the Elite Pro).

    I didn't choose the 2.0TB OWC Mercury Elite Pro mini Portable FW800+USB2+eSATA because Macs will usually not have eSATA and FW800 is a bottleneck. I would consider a FW800+USB3+eSATA solution in the future if it was just as portable as the On-The-Go.

    My only complaint is that the rubber feet on the bottom cover the screws. If you replace the 2.5" drive more than a couple times, then the feet will eventually stop sticking. I see no reason to hide the bottom screws since the bottom is usually not visible and the side screws are not hidden at all. The drive was shipped to me with the rubber feet not positioned exactly correctly so that the drive did not sit properly on all 4 feet but this is easily fixed.

    I would recommend this item to a friend! This review is from 1.5TB OWC Mercury On-The-Go Pro Portable FW800&400/USB3 5400RPM Storage Solution.

    Response from MacSales.com, Marketing February 27, 2013 We do have the replacement "feet" available here: http://eshop.macsales.com/item/OWC/MANOTG125MM/
    Verified Buyer
    Reviewer: Anonymous Location: Mountainair, NM Age: Over 65 Experience Level: Hobbiest Owned Product: less than a month
    Rating: 5/5 Just what I needed December 26, 2012 I bought this so I could quit using my old Apple Time Capsule for backups. I was tired of the wifi connection drop-outs that sometimes happened when Time Machine would start a backup.

    I use the FireWire 800 connection and backups are done before you know it.

    The drive ships with a FireWire 800 cable, a USB 2 to USB 3 cable and a disc with data backup software.

    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: Burini Location: Brasil Age: 35-44 Experience Level: Power User Owned Product: less than a month
    Rating: 5/5 otimo product November 20, 2012 received on time and I am already using case ... very fast .. I'm using him as a 750 gb hd that was in Pro mac .. was very fast ... conecxao extra doors are very fast to ... usb and normal as any other .... but the high speed of it .. really are high-level

    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.

    OWC 250GB OWC On-The-Go® Pro Mfr P/N: MS8U3SSD240 OWC SKU: OWCMS8U3SSD240 SSD Bus-Powered, Multi-Interface Storage Solution 3 Year OWC Limited Warranty Ships: Same Day
    Reviews (214)
    Only $99.99OWC Price $89.99
    Add to CartOther World Computing MS8U3SSD240 In Stock, Click to Buy Now
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