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Co-designed by PROMISE & Apple
Fine-tuned for Apple’s 2019 Mac Pro Ready for mac OS Catalina
Legendary PROMISE Engineering, Quality & Support

New internal storage options, custom-designed for the Mac Pro. PROMISE Pegasus R4i MPX RAID Storage Module and Pegasus J2i enable end-users to easily and safely store, access and manage critical digital assets.

Pegasus R4i

MPX RAID Storage Module for Mac Pro
  • 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

Pegasus J2i

Internal Storage Enclosure for Mac Pro
  • Custom 2 Bay enclosure and cable assembly
  • One 8TB 7200rpm SATA HDD pre-installed, pre-formatted
  • Bay and kit for optional additional 3.5” SATA HDD (to be installed by end-suer)


Pegasus R4i
Pegasus R2i
32TB raw
8TB raw (as shipped)
Form Factor
Full height MPX Module for Mac Pro
2-Bay Internal Storage Enclosure for Mac Pro
MPX connector for 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 HDD, preformatted HFS+. Add your own 3.5” SATA HDD
RAID Level
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
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