Technical Specifications

Mac Logo


Mac Compatibility

  • Mac Pro 14,8 (2023) Desktop and Rackmount
  • Mac Pro 7,1 (2019) Desktop and Rackmount

Boot Support

  • Mac Pro 2019 (Intel)
  • SSD connected to USB port bootable
  • SSD/HD connected to SATA port bootable(1)
  • Mac Pro 2023 (M2 Ultra)
  • SSD connected to USB port bootable(2)
  • SSD connected to SATA port not bootable


Part Number



  • 2-year

Form Factor

  • Expansion bracket

Dimensions (WxDxH)

  • 5.5 x 4.7 x 3.4 in. (14 x 12 x 8.7 cm)


  • RoHS 3 (Directive 2015/863)
  • IEC62368-1 and IEC62368-2 Safety

Package Contents

  • Fusion Flex J3i Expansion Bracket
  • 2.5-inch drive mounting bracket x2
  • 2-drive SATA data/power cable assembly
  • USB-3 to SATA data/power adapter cable
  • Vibration isolators and mounting screws

Support Links

Support Knowledge Base

Documentation and FAQs

Product Manual

Fusion Flex J3i Manual PDF Download Link

Technical Notes

  • Booting from Mac Pro 2019 from SATA port requires Security Setting change to enable external boot because macOS treats Mac Pro 2019 SATA ports as external.
  • To create a boot volume for Mac Pro 2023: a) install SSD in Fusion Flex J3i and connect to internal USB 3 port; then b) format SSD and install macOS.

Fusion Flex J3i