• 5.0 out of 5 stars

    Top notch performance.

    • Written by from Floral Park

    I picked up this raid array yesterday, slapped 4x 1TB Seagate 7200 RPM NCQ(Native Command Queuing) hard drives in them, and got performance on par with the fastest SSD's on the market in Raid 5 configuration. 680 Write, and 580 read. The performance goes up when you stripe them, but you don't have redundancy in that configuration. I'm very pleased with this product and highly recommend it. Did I mention its whisper quiet and goes to sleep/shutdown when the computer attached is in either states? the mac osx utility is also elegant and works seamless with a wizard and monitoring tool.

  • 5.0 out of 5 stars

    If you have a Mac Pro you need this

    • Written by from prairie village

    I recently recieved my enclosure. I had spent a great deal of time researching enclosures and it seemed the best. I backed up all my data and put 4 4TB drives in and migrated my data from my old Mac Pro. I am very pleased. I use this with my 6 core Mac Pro. It is very fast. I had been using an external drive with USB3. There is no comparison.

    Be sure to download the utility from Promise. It has nice features and is straight forward. I read the manual cover to cover so I felt comfortable with the device. It has performed perfectly. It is thrilling to have my 120K images so easily accessible. The fan is audible on the scale of my old 2006 Mac Pro. I will put the enclosure in a sound proof ventilated case.

    It makes the Mac Pro a real thing of beauty.

  • 1.0 out of 5 stars

    Stay Aawy

    • Written by from Van Nuys

    These housings are very bad. They work great when you first get them. Then a drive bay will keep failing a drive every 3 months or so. I have changed 4 drives in the same bay and Pegasus refuses to acknowledge it is the housing with the issue. Look elsewhere. You have been warned.

    I will gladly unload this thing for half what I bought it for.

    6 of 9 people found this useful

  • 5.0 out of 5 stars

    Recently installed with three 4TB WD

    • Written by from Orefield

    I received the Pegasus2 four days ago to use with my nMacPro. I placed three of my drives from the old Macpro in the enclosure and connected thunderbolt and started it up. It placed the drives in JBOD mode (Just a Bunch Of Drives), which Pegasus2 calls pass-thru.

    Everything seemed to work fine, so I purchased four WD 4TB 7200 Black drives and installed them yesterday in place of the old Macpro drives. I needed to download the Pegasus software and manual from Promiseworks to aid in the setup. The Wizard option did not appear, so I used the advanced method for setup. Pegasus has a free number to call for assistance and registration.

    I set up a Raid 5 array using the three drives for a total do 8TB of disk space. The logical drives shows up on the desktop with that amount of space. Synchronization took 9 hours. When it had finished, I installed one of my old drives in the fourth slot, and I am using that to transfer about 2TB of data to the Raid 5. When that is done, I will replace that old Macpro drive with a other old Macpro drive and repeat the process until all of my data has been transferred.

    If I need more space in the future, I can add a fourth 4TB drive to the array and transition it to the Raid 5 with total space of 12TB without losing any current data. This is a very elegant data storage solution

    4 of 4 people found this useful

  • 5.0 out of 5 stars

    Very happy with this product

    • Written by from miami

    the shipping says like 8 weeks but it came in about 2. Very happy with the software, easy of use, and speed. Over the many other options this was my favorite especially for a diskless unit. The raid setup is very easy, I would recommend.

    2 of 2 people found this useful

  • 5.0 out of 5 stars

    Great transition from old Mac Pro...

    • Written by from Toronto

    Inserted four Hitachi 4TB hard drives from my old 2010 Mac Pro. Worked without any issues.

    Pros: i) fastest transfer speeds available for regular hard drives, ii) good power management features (auto sleep, shutdown), iii) good price relative to competition.

    Cons: i) 20 seconds to mount the hard drive.

    *Caveats: i) Used in JBOD / Pass-through mode with software RAID via Disk Utility (did not install Promise Pegasus software), ii) Thunderbolt daisy chain feature only works if the unit is powered on.

    3 of 3 people found this useful

  • 5.0 out of 5 stars

    Setup requires a bit of research

    • Written by from Valencia

    Regarding a couple of the notes in reviews above:

    There is no documentation in the box on how to set this up when adding your own disks. The quick start guide included refers to a unit shipped with disks installed. Going to the Promise website and downloading the Promise Utility software for the Pegasus line is required. It is still at that point not fully obvious on how to format the unit to a single logical RAID 5 array, but not too difficult to figure out using the wizard in the utility.

    Regarding the unit not shipping with screws to secure your HDDs into the sleds, I thought so at first as well, but located a very small (1"x2") baggy with 20 of the needed screws in it. They may have missed including it in Andrew Hs unit, or it may have been overlooked as it is pretty small.

    Kudos to Promise for including the thunderbolt cable.

    In a silent room, the unit is audible, but not loud. Subjectively about one third as loud or less as my 17" MBP with fans ramped up.

    Performance is as reported in the reviews. For anyone curious, the unit functions fine with WD Se drives, and still comes in cheaper than the populated 8TB version.

    6 of 6 people found this useful

  • 5.0 out of 5 stars

    Fast and Reliable

    • Written by from PHOENIX

    I placed four Samsung 1TB Evo SSDs in the Pegasus, and it is screaming fast. I use it for editing/storing photos, and it runs seamlessly with Lightroom and PS. Setup was very easy. I have owned a Pegasus R6 for about a year, and that unit has performed flawlessly, so I am confident the R4 will follow suit. It's not cheap, but I would highly recommend the R4 to anyone who needs very fast storage options.

    7 of 7 people found this useful

  • 5.0 out of 5 stars

    The best value in the Pegasus2 Line

    • Written by from brooklyn

    I have 4x4TB Seagate drives installed in my Pegasus2 R4 Diskless. In Raid5 you end up with 12TB storage. The 4th disk is for redundancy to protect your data in case of a single disk failure.

    -It runs very fast as a RAID 5.
    -I love that it automatically powers on and off with my Macbook Pro.

    -Setup is slightly confusing (even after reading the manual twice). Read the entire manual before you even start, even if you have RAID experience.
    -initialization took several hours.

    For anyone considering the R4 8TB, I cannot recommend it. It offers this enclosure, but unfortunately ships with 4 inexpensive consumer grade 2TB drives that the manufacturer is marking up almost 100%. That was extremely disappointing to find out. For the same price you can purchase this and shop around for the best deal on the fastest 3.5" drives you can find.

    7 of 7 people found this useful

  • 5.0 out of 5 stars


    • Written by from New Milford

    Just received the new Pegasus 2 R4 and loaded it up with (4) 4 TB drives. Literally took 15 minutes to setup and it has been online and working ever since. I/O speeds are great on a Mac mini with Thunderbolt 1. Promise Software takes a little bit of learning, but still very simple and easy to use. Highly recommend!!

    5 of 5 people found this useful

  • 5.0 out of 5 stars

    Rock solid, great performance!

    • Written by from San Francisco

    We've had this for more than a week now, and it really delivers. Since it's just a 4-bay enclosure and we're using it with 7200rpm media, we're not pushing the upper limits of even Thunderbolt, let alone Thunderbolt 2 performance, but for us it was about being future proof. The fast interface will come in handy if and when we eventually swap out the spinning HDD's for SSD's, or when we start adding more storage devices to the chain.

    With the diskless unit, you need to download the Promise Utility from the manufacturer's web site, and once that's installed it's a pretty powerful tool for managing the device and setting up the drives. We put it through its paces configured in RAID 0 and in RAID 5, and are very happy with the results. It's worth pointing out that when setting up a RAID 5, you'll also need to give it time to synchronize (basically setting everything up for parity). It takes several hours (we let it run overnight), but this was much faster than other RAID devices either of us has used in the past.

    The Pegasus2 R4 is also quieter than we expected, and we're happy to report that we can't really hear it above the ambient noise in our studio. Big thumbs up all round, this is highly recommended.

    9 of 9 people found this useful

  • 5.0 out of 5 stars

    Fast, quiet, solid

    • Written by from New York

    I've been using it for about a week now with a pair of 3TB Hitachi Deskstars (HDS72303) in JBOD mode (called "Pass Thru" by Promise) transferred directly from an old Mac Pro. No problems at all, except that Promise doesn't include mounting screws for the hard drive sleds; the big head screws from the Mac Pro protrude from the side of the sled and prevent it from sliding back into the unit, so be sure you have small/flat head mounting screws. I'd read about power management issues with this unit, but it's been perfect through multiple sleep/wake and on/off cycles. Very pleased so far.

    29 of 30 people found this useful

  • 5.0 out of 5 stars

    Great device, a bit of trouble setting it up though

    • Written by from Dedham

    The Promise Pegasus2 R4 is a great device. It's not the smallest or quietest Thunderbolt RAID enclosure (though it's by no means large or loud), but it's definitely among the fastest. It's also highly versatile - each disk can either be used independently or as part of a disk array (RAID 0, 1, 5, 6, or 10) and easily handles I/O that brought my old Drobo to its knees.

    That said, I suspect that the "diskless" Pegasus2 was probably somewhat rushed out, which led to some annoyances setting the device up. The process of adding hard drives is quite easy: just put the drive in the sled, secure the four screws, then slide into the Pegasus2 and latch into place.

    However, all four drives show up as separate drives attached to the system. To combine them into an array, the Quick Start Guide says to consult the Product Manual, which is not included in the box. You can find it online if you're interested, but the short of it is that you need to use the Promise Utility. Normally this is included on the drive, but since this is the diskless model, it, too, must be found online. I can't provide a link here, but just search the internet for Promise Utility 3.18.0000.18 and you should find it in Promise's Download Center.

    Once the Promise Utility is installed the fastest way to get started is to use the Wizard. After the array is set up you should be good to go.

    70 of 73 people found this useful

  • 5.0 out of 5 stars

    Very pleased

    • Written by from Crystal Lake

    I just received it today in preparation for the new Mac Pro I've ordered. Just as advertised, plugging in the four disks from my old Mac Pro worked well using the Thunderbolt port on my Mac Book Pro. I haven't used it long enough for an in depth review but so far I'm very pleased. It's fast and very quiet. The fact that it was diskless was a big bonus.

    55 of 58 people found this useful