This site uses cookies to enhance your web site experience. By continuing to browse or use this site, you are agreeing to our use of cookies. See our privacy policy here.
Developed by Promise for Apple
Fine-tuned for Mac Pro and macOS
Legendary PROMISE Engineering, Quality & Support

Internal Storage Options for Mac Pro – PROMISE Pegasus R4i RAID Storage MPX Module and Pegasus J2i to conveniently store and speedily access upto 32TB of data over internal buses.

White paper

Pegasus R4i

RAID Storage MPX Module for 2019 Mac Pro

  • Robust PromiseRAID engine for performance and peace of mind
  • Elegant and rugged chassis designed uniquely to fit into Mac Pro’s MPX slots
  • Plug & Play with built in driver in macOS
  • Four swappable modules with 8TB 7200rpm SATA HDDs pre-formatted and pre-installed
  • Best-in-class Pegasus hardware RAID an optimal combination of capacity, redundancy and performance with up to 680 MB/s in RAID5
  • Promise Pegasus Utility for simple-to-use but powerful storage management and monitoring
  • Compatible with 2019 Mac Pro with macOS Big Sur and later versions

Pegasus J2i

Internal Storage Enclosure for Mac Pro

  • Custom 2 Bay enclosure and cable assembly
  • One 8TB, 14TB or 20TB 7200rpm SATA HDD pre-installed, pre-formatted
  • Bay and kit for optional additional 3.5” SATA HDD (to be installed by end-user)
  • Compatible with 2019 Mac Pro (Intel x86 CPU) and 2023 Mac Pro (M2 Ultra CPU)


Pegasus R4i
Pegasus J2i
32TB raw
8TB, 14TB or 20TB raw (as shipped)
Form Factor
Full height MPX Module for 2019 Mac Pro
2-Bay Internal Storage Enclosure for 2019 and 2023 Mac Pro
MPX connector for 2019 Mac Pro
SATA3 with custom power and data cable to Mac Pro
Storage Devices
Four SATA3 7200 rpm 8TB HDDs, preformatted HFS+
One SATA 7200 rpm 8TB, 14TB or 20TB HDD, preformatted HFS+
Add your own 3.5” SATA HDD
Preconfigured RAID5
Supports RAID levels 0, 1, 5, 6, 10, JBOD
337 x 164 x 80 mm (13.3 x 6.5 x 3.2 inch)
155 x 121 x 99 mm ( 6 x 4.8 x 3.9 inch)
4.2 kg / 9.2 lb (with 4 HDDs)
0.96kg / 2.1 lb ( with 1 HDD)
3-Year hardware warranty, global support

Product Review

Promise Pegasus R4i and J2i add massive storage to the new Mac Pro

Get the newest product review of Pegasus R4i/J2i here!
Let's check out the significant comments brought by Mr. Andrew O'Hara, and the rating is 4.5 out of 5! Bump!

Andrew O'Hara-December 23, 2019

Learn more

Promise Pegasus R4i MPX Module – add a massive amount of storage to the Mac Pro

Do you want to know why you should consider it for your Mac Pro? Let’s see why Mr. Jeff Benjamin concerned the benefits of Promise Pegasus J2i to Mac Pro. Watch the hands-on walkthrough for more details.

Jeff Benjamin- Dec. 20th 2019

Learn more


Broadcast India Show 2023


intersec Saudi Arabia 2023

Riyadh International Convention and Exhibition Center (RICEC)

IBC 2023

RAI Amsterdam

BroadcastAsia 2023

1 Expo Drive, Singapore 486150
Copyright ©2024 PROMISE Technology Inc. All rights reserved. / Terms Of Use / Privacy Policy / Contact Us