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PROMISE Pegasus J4 J4US RAID 0/1, JBOD 2 x Thunderbolt Port Thunderbolt Enabled Storage (Enclosure Only)

  • SATA
  • RAID 0/1, JBOD

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the Promise Tech. J4US


Pegasus J4


External I/O
2 x Thunderbolt Port
RAID Levels


2.5" Drive Bays

System Management

OS Supported
Supports Time Machine in Mac OS X


J4 Enclosure Only - 0TB*

2 x Thunderbolt technology ports at 10 Gb/s (1.25GB/s)

Supports 2.5" SATA SSD and HDD

Delivers over 750MB/s with SSDs (Up to 480MB/s with 7200 rpm HDDs)

Supports daisy chaining up to 6 Thunderbolt technology-compatible devices

The Pegasus J4 is designed from the ground up for creative professionals and multimedia enthusiasts who demand incredible versatility and amazing performance in a storage solution.

The J4 enables you to work remotely with a laptop and edit footage on-site, delivers the flexibility to customize the solution, and provides the performance to optimize your workflow.

*Note: Please select the HDD from the J4 HDD compatibility list and make sure the height of the HDD you select is below 9.5mm.

Dimensions & Weight

1.6 Kg
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years
  • Read full details

Customer Reviews of the Promise Tech. J4US

Do you own this product? Write a Review

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  • Doug M.
  • 9/30/2013 8:24:23 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year

5 out of 5 eggsAwesome

Pros: Fast, compact, reliable, no wall wart.

Cons: None.

Other Thoughts: Can't imagine why you'd use this to boot a Mac Mini.

1 out of 1 people found this review helpful. Did you? Yes No

1 out of 5 eggsworthless for booting

Pros: fast and stable for long copies.

Cons: This unit does not boot. Repeat this is bootless.

I own a promise pegasus r6 great gear and it boots. I own a pegasus r4 great gear and it boots. I own a pegasus j2 decent piece of gear and it boots. I own a lacie little big disk and it boots. Lastly i own a seagate stae 121 thunder bolt adapter and it boots. So making thunderbolt boot is the rule not the exception.. Imagine my surprised when this gear does not boot.

To make it worse it stacks to perfection with an apple mac mini. A piece of gear that has very limited disk options and to diy a hdd to ssd upgrade voids warranty. So to put it very simply What T F is promise thinking. What engineer or CEO or pencil pushing moron allowed this. My other promise gear has been close to perfect. So now when I have a lot of clients that want a neat clean mac mini storage/booting upgrade the perfect form (pegasus j4) is half function just storage not boot.

The perfect function(pegasus r6 ,r4 and j2 is the wrong form. I have written nasty but completely true reviews about this in 3 sites . I wish the manufacture would tell us they have a firmware fix for this. So sad truly sad that a company could do this. Basically they are only hurting their bottom line for no apparent reason.

Other Thoughts: to promise Have a heart and gives us a good reply

1 out of 3 people found this review helpful. Did you? Yes No

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