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Promise Technology R4 Enclosure with 4x1TB SATA Drives Power Cable, Product CD and Quick Start Guide (PR401US)

3.0 out of 5 stars 19 customer reviews
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  • Direct Attached Storage with 4TB
  • 2x Thunderbolt: 10Gbps Speed Per Port
  • 4x 1TB SATA 7200rpm Drives
  • Sustained Throughput of Over 500MB/s
4 used from $459.99

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Product Information

Technical Details

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Summary : Screen Size, Screen Resolution, Graphics Coprocessor, Graphics Card RAM
Hard Drive 4 TB External
Other Technical Details
Brand Name PROMISE TECHNOLOGY
Item model number PR401US
Item Weight 18.9 pounds
Product Dimensions 12.8 x 11.2 x 12.7 inches
Item Dimensions L x W x H 12.8 x 11.2 x 12.7 inches
Color Black, Silver
Hard Drive Rotational Speed 4200 RPM

Additional Information

ASIN B0055SE076
Customer Reviews
3.0 out of 5 stars 19 customer reviews

3.0 out of 5 stars
Best Sellers Rank #700 in Computers & Accessories > Data Storage > Network Attached Storage
#16,991 in Computers & Accessories > Networking Products
Shipping Weight 17.2 pounds
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available June 14, 2011

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com 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 unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com 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

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Customer Questions & Answers
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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsWOW
By Promix01 on September 11, 2011
Verified Purchase
I am currently using this drive attached to a new iMac 27" maxed out on processor and RAM.. we have been in the field the last 3 weeks shooting a project bouncing the footage down to this drive from our firewire 800 card reader is quite fast.. once its on the drive playback is un hitched and speedy even using the compressed sometimes stuttering codec of H264...

We are now in the studio, and the drive is being used as our main edit drive for this project.. we have 2TB of footage encoded to Apple Pro Res 422HQ , we are playing back 4 layers of video through FCP and we see NO LAG, this drive is SPEEDY !!!!! Its built to transport if you have the appropriate road case with
shock support.. its just simply stunning how quick this drive is.. Thunderbolt is absolutely an amazing new way to interconnect devices, it will be the future of what everything is connected with , still faster than USB3 and blows away firewire 800....

The software that comes with the drive is a little clumsy but very intuitive, you can manipulate all of the drive properties from it, quick to install, but may take a minute to learn where all the attributes are..

When you first power the drive up, you will need to wait for an initilisation process to happen which took for me about 12 hours, so don't expect to use it right out of the box.

Overall i would and will absolutely buy another one of these drives.. Would totally recommend it to any AUDIO or VIDEO professional.
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3.0 out of 5 starsnot user friendly in everyday work
By wolf on December 10, 2011
Basically it's a solid box, but in everyday work there are several limitations which make the handling cumbersome:

- the device has no sleep mode. this means that your discs spin all the time which decreases lifetime and increases power consumption
- it makes some noise so either sleep or power down would be nice while you do not need access (eg. when a backup finishes)

- when you power the device off, it breaks the thunderbolt connection to all devices behind it. in my case that is an external screen. so you have to replug things or leave the device always on - consuming power, increasing disc wear, making noise
This breaking of the TB chain makes it nearly unusable as a backup device which should only be mounted during the backup is made

- the software which comes has nice icons, but is hard to handle - I found no option to power down from the software side. To shut it down regularly you have to hold the power button for several seconds (like a reset on a mac). this is boring and does not always work

- the device only has a thunderbolt interface (2 plugs) - no USB, no network connection. This means you can only use it with apple hardware later then february 2011. there is no way to get to your data with older macs. this is a real limitation, especially in case of emergency when your thunderbolt machine breaks down and your older emergency hardware comes in

- the usage with bootcamp (for Windows) is not possible to my knowledge

the basic function of storage works fine up to now. but in day to day work it's limitations are annoying
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1.0 out of 5 starsnot compatible with newer machines
By Y. Lee on October 5, 2012
Along with Apple tech support we have deduced that the Pegasus R4 firmware is NOT compatible with the firmware issued from Apple on Sept 19th for the Macbook Pro Retina. A number of users have been having problems with this. I will be returning the Pegasus and purchasing a Thunderbolt drive that works with the system.
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4.0 out of 5 starsHuge, Slow to Rebuild, But Crazy-fast
By Jason Rist on February 28, 2012
Verified Purchase
Like others have said, I don't think this is for a novice user. It's a fantastic piece of tech, but you need a bit of technical prowess and patience to use it. I had to grab the Promise Utility from the web, and even then, the Promise Utility doesn't start correctly at all (the window doesn't show up) if the R4 is not properly connected (even though the blue thunderbolt icon on the R4 was lit up).

A few reboots, some cursing, and about 20 hours later, I was up and running. Oh yeah, you can't touch it until it's done "synchronizing" or whatever the initial RAID setup is called. (Initializing?)

Aside from the hiccups, this drive is REALLY fast - basically like having an internal 3TB drive (yeah, 1TB gets used for the RAID5 setup).
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5.0 out of 5 starsNot sure why the negative reviews....this thing is AWESOME
By A Friendly Traveler on the Amazon trade road on December 31, 2012
I've had mine for over a year now. I use it to record 10bit uncompressed video to with an BlackMagic UltraStudio 3D and a macbook pro in my thunderbolt workstation. I can record 500MB/s video with this. It is still the only 4-bay thunderbolt enclosure in existence (which is crap...come on Intel.. Stop being so difficult with your thunderbolt certifications. I really wanted that damn Belkin thunderbolt hub w/ HDMI to come out someday, but noo..not on your watch huh?)

So, yah...this thing is expensive, but come on people......only buy it if you need it and know how to use it. It is a professional tool and a minimum expectation of knowledge is usually expected with these items.

Mine has worked rocksteady for the past year, UNTIL LAST MONTH when one of the thunderbolt ports decided to die on me, but I honestly think it was the UltraStudio3d that shorted it since it also electrocuted me (no joke..but it was a minor jolt). Called PromiseTech and they sent me out a replacement chasis about a week later. I swapped the drives into the new enclosure, reconnected my freshly RMA'd UltraStudio and I was back in business. Working with Promise to RMA the R4 was very easy and no trouble at all. They are way better at customer service than the majority of pro gear manufactures.

PROTIP: You can put 3TB Seagate 7200RPM drives in these, which can sometimes be found for under $100 a piece and turn this into a 12TB behemoth (or 9TB with a more data secure RAID5)
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Most Recent Customer Reviews

1.0 out of 5 starsCaveat Emptor

I would never deal with this company’s products. I bought a Pegasus R4, which developed a fault in the chassis, thereby making it impossible to download data to the storage discs,... Read more

Published 11 months ago by Philip John Perry
2.0 out of 5 starsWe were very happy with it until the enclosure failed after about just...

We were very happy with it until the enclosure failed after about just 6 months of use. Thankfully, the data was fine, but we lost an expensive day of productivity and had to buy... Read more

Published 23 months ago by Mathew K. Higbee
5.0 out of 5 starsWas a good deal Writing and reading speed

Was a good deal
Writing and reading speed Excellent

Published on October 2, 2014 by mubarak alsubiae
1.0 out of 5 starsIf backing up critical data is your goal, this is not the product for...

I've owned a Promise R4 for a little over two years. I use it as a backup for critical files on a Macbook laptop. The unit has caused nothing but problems. Read more

Published on October 2, 2014 by Bruce Taylor
5.0 out of 5 starsthe best and affordable and reliable choice

For a home storage solution, the best and affordable and reliable choice.

Published on September 29, 2014 by A. Popescu
4.0 out of 5 starsAmazing Drive

I bought this drive from Amazon in 2012 and the first few month of usage the drives went offline, I contacted the manufacturer and I was asked to put the drive online connected to... Read more

Published on November 1, 2013 by Mfon E.
5.0 out of 5 starsA real workhorse

I have been using my Promise Pegasus for almost two years now and I love it. I use it for editing HD video and has been working great. Read more

Published on September 17, 2013 by VideoRobb
5.0 out of 5 starsThe Promise team delivered a great product

So far I love this sucker. I'm running it in raid 5 off my 27in 2012 iMac connected via Thunderbolt. Read more

Published on September 12, 2013 by JWP
5.0 out of 5 starsAwesome transfer speeds

My experience with this R4 unit:

PROS -

- Speed; very quick data transfers; on average about 2x faster than USB 3.0. Read more

Published on February 22, 2013 by AC
1.0 out of 5 starsAudio distortion and dreadful customer service

For almost a year I have been waiting for a solution to a problem of audio distortion when my Raid R4 is connected to the Thunderbolt Display. Read more

Published on September 22, 2012 by JagsB

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