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Promise Technologies Pegasus J4 2TB Enclosure for 2.5-Inch SATA SSD/HDD (J4HD2TBUS)

12 customer reviews

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  • 2TB (4x500GB) Drive Configuration
  • Supports 2.5" SATA SSD and HDD
  • 2x Thunderbolt 10Gb/s Interfaces
  • Data Transfer Rate: Up to 386.82MB/s

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Product Description

Promise J4HD2TBUS Pegasus J4 2TB, Power Cable and Quick Start Guide

Product Information

Expand all Collapse all Technical Details
Item model numberJ4HD2TBUS
Item Weight3.5 pounds
Item Dimensions L x W x H13.10 x 10.70 x 4.33 inches
Additional Information
Best Sellers Rank
Shipping Weight4 pounds
Domestic Shipping Item can be shipped within U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First AvailableDecember 1, 2012
Warranty & Support Return Policy: You may return any new computer purchased from that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellableRead more condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

Product Warranty: For warranty information about this product, please click here

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

21 of 23 people found the following review helpful By Jon on March 25, 2013
Verified Purchase
FIRST OFF: This is NOT a bootable device. Its meant for user who need fast external storage, NOT those who want to boot from it. So don't buy and then complain about booting.

I've been looking for a non-Raid thunderbolt solution since 2011. After extensive research, I took the leap with this Pegasus J4. My drives (Crucial M4 512GB SSDs) were not on the compatibility list at the time of purchase, but I desperately took the risk. The core purpose is to fetch data to my Early 2013 Retina MacBook Pro. I do 3D animation, Music Production, and Video Editing. All of my content are stored on the SSDs in the J4.

- Easy to open and install drives
- Two thunderbolt ports (should be standard for every thunderbolt device)
- Mac Drivers seem stable thus far
- Holds 4x 2.5" drives
- Neat size can fit in my bag
- MUCH quieter than my Lacie LBD.

- No Windows Driver yet (I have Windows 8 on bootcamp)
- Included software could be enhanced. (Better realtime monitoring, fan control, and extensive drive health)

My primary need has been met, which is a single cable to access all my SSDs at high speed.

UPDATE: This enclosure has been serving me well. Still, I don't see any support for Windows in sight (maybe never for this model). Lately I've also been considering the Blackmagic MultiDock 2 which has similar function, but rack-mounted with easily swappable drive bays...for a better price. So based on what you prefer (mobility or modularity), they are your best options. HOWEVER, if you need Thunderbolt 2 support, your best bet as of now is the Multidock 2.
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9 of 10 people found the following review helpful By Joel Lopes Da Silva on April 23, 2013
I bought an empty Promise Pegasus J4 as soon as they were available for sale, and I've been using it ever since. I've never had any trouble with it. Unlike what some of the other reviewers have experienced, it has always booted just fine for me.

At the time, I was looking for an empty external storage enclosure with the following features:
- ability to plug four drives or more;
- ability to pick my own drives (i.e. empty enclosure);
- ability to use this in JBOD mode;
- DAS enclosure with Thunderbolt connectivity;
- ability to daisy chain with other Thunderbolt devices;
- very compact (relatively speaking; of course such a thing can't be as small as a single portable external drive).

My reasons for wanting such an enclosure are that I wanted to setup a Mac Mini as small home server with a large ZFS pool; but since my server is very small, I didn't want this enclosure to take up a lot of room.

With all of those requirements in mind, I feel that the Pegasus J4 delivers in a big way. Its physical footprint is just perfect for my current usage, since I can just stack it on top of the Mac Mini; it's even very close to the Mac Mini design-wise. Of course, the downside of that is the fact that we are very limited in terms of the amount of storage that can be used in the enclosure, because it only supports 2.5'' drives. But the second Thunderbolt port makes up for it, and I feel confident that if one day I need more storage capacity, I can simply purchase another similar enclosure, and daisy chain it with my current one.

The only real downside that I see in this product is that it can only fit 9.
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First, I must mention that I have seen mixed reviews on this device and I treat these people harshly because I had to wade through all these critics before I took the plunge. Next, I want to add, the best purpose for this equipment is 1) on a mac mini (not portable and not Windows!) and 2) as a SSD RAID 0 enclosure. Only with these 2 conditions will you get the full function out of this equipment. This requires a bit of investment, but if you can afford this enclosure than you should know your price range. I have used 4 256 GB SSDs (I got the best deals so they are not all identical which affects performance only slightly but the price is much better) I also use the newer shorter cable from Apple which is only $29.
Combining these in RAID 0, I get a 1 TB drive that screams at 700-800+ MB/s and use fusion drive to combine this with 1-2 larger Hard Drives and you will have sizeable storage that beats anything on the market. If you are not interested in speed, then there is no reason at all to spend a bit of money on this. Putting hard drives in, even 72k will only get 300-400 and a limited amount of space with no room for failure. I would much rather have no room for failure with an extremely fast array that is backed up. You can get a fully redundant array for 2k with similar storage size but you are also in the same boat if a drive fails unless you spend even more for a backup drive or wait for the RMA. I would rather spend half and get the same/better performance out of a stylish device and backup to other redundant volumes (which needs to be done anyway if you care about your data)
Any comparison to the Seagate Desktop and Portable Thunderbolt shows a clear lack of understanding as both those devices (which I own for the record) do not serve to function above USB 3.
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