Fusion Flex J3i

3-drive mounting system for Mac Pro (2023 or 2019)

Add your own SATA drives

Mount up to Three SATA Drives in Your Mac Pro

While the Mac Pro offers fast 3,400 MB/s internal SSD storage, capacity is limited to 8TB. Connecting external drives is an option, but why not just use the space and connections inside the Mac Pro to add capacity? Sonnet’s Fusion™ Flex J3i makes it easy, enabling you to securely install and connect up to three SATA drives (sold separately) in the available space next to the PCIe card slots.

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Front view of Fusion Flex J3i without installed drives.

Fusion Flex J3i with two hard drives and one SSD.

Install Two 3.5-inch Drives Plus One 2.5-inch SSD Into Your 2023 or 2019 Mac Pro

Not only does the Fusion Flex J3i provide support for mounting two 3.5-inch hard drives of your choice, the Flex’s custom design provides mounting support for an additional 2.5-inch SATA SSD. Of course, the necessary mounting hardware and connecting cables are included for a clean installation.

Drives sold separately

Or Install Three 2.5-inch SSDs

The Fusion Flex J3i includes mounting plates and screws that enable you to install three 2.5-inch SSDs in total.

Drives sold separately

Fusion Flex J3i RAID 0 Performance

RAID your SSDs in the Fusion Flex J3i to achieve superior performance

Two 2.5" SATA SSDs RAID 0

Three 2.5" SATA SSDs RAID 0

Performance based on ATTO Disk Benchmark (available on the Apple App Store) test results with SanDisk® Ultra II 1TB SSDs with 8MB and greater transfer size. Two SSD RAID 0 tested with both SSDs connected to internal SATA ports. See our Performance PDF for additional benchmarks and details.

Custom Design, Rugged Construction

Sonnet designed the Fusion Flex J3i to make maximum use of the space and connections inside the Mac Pro; constructed out of heavy-gauge aluminum, the J3i looks right at home inside the computer. Shock and vibration isolators for 3.5-inch drives protects each drive from cross-coupled vibration from the other, safeguarding against read/write errors and retries. Mounting plates for 2.5-inch drives are included, so there’s no need to purchase separate pieces to use them. Custom power and data cables deliver a clean look to the installation.

Migration Assistant

The Fusion Flex J3i makes it easy to move two 3.5-inch hard drives from your 2010 or 2012 Mac Pro into your 2019 or 2023 Mac Pro, with no additional adapters or cables required.

Key Features

Add up to 52TB of Storage

Mounts up to three cost-effective SATA drives (sold separately) inside a Mac Pro. You get to choose the drives that suit your needs.

Mounts up to Three SATA Drives

Custom bracket and cables support one 2.5-inch SATA SSD plus two 3.5-inch SATA drives, or three 2.5-inch SATA SSDs.

Rugged & Custom Design

Vibration-absorbing isolators safeguard reliable disk operation whether in the studio or on the road; designed to make maximum use of the space and connections inside the Mac Pro.

Sonnet Support

Founded in 1986 in Orange County, Southern California — long recognized as a vibrant hub of technology and engineering — Sonnet has been at the forefront of innovation for nearly four decades. We’ve introduced award-winning products that expand performance and connectivity for Mac, Windows, and other industry-standard computers. Many of our team members have been with us for more than 20 years, bringing unmatched expertise across both current and legacy products. Should you ever need technical support, you can count on our knowledgeable staff to provide the help you need.

See Tech Specs for footnotes.
Product specifications and information subject to change without notice. Computers and accessories that may be featured in photos are not included with the product.

Add up to 52TB of Storage!

3-drive Internal Mounting System