Mac Pro 2019 Pegasus J2i Enclosure questions

My MPro 2019 has a Pegasus J2i enclosure which currently has an 8TB and a 2TB drive in it. Works fine and need to know what is the biggest size drives I can put in that enclosure?

Mac Pro, macOS 15.4

Posted on May 10, 2025 7:25 AM

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Tom Ritch

Level 2

284 points

Posted on May 16, 2025 9:22 AM

Confirming Grant's reply, the Promise web site gives details on recommended drives.

Pegasus Hard Drives Compatibility list Summary (including Pegasus 1/2/3/32 M4, R4i and J2i)

A linked page lists recommended drives, including which have been tested. The largest is 24 TB.

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3 replies

Top-ranking reply

Tom Ritch

Level 2

284 points

May 16, 2025 9:22 AM in response to dagwaremedia

Confirming Grant's reply, the Promise web site gives details on recommended drives.

Pegasus Hard Drives Compatibility list Summary (including Pegasus 1/2/3/32 M4, R4i and J2i)

A linked page lists recommended drives, including which have been tested. The largest is 24 TB.

May 10, 2025 7:43 AM in response to dagwaremedia

the largest capacity drives you can find. Promise sells an 18GB drive, and says you can add another 3.5-in form factor (desktop/server -class) drive in the second 'bay'.

the ability to support very large logical-sized drives was added in MacOS X 10.4 Tiger, and that upper limit is HUGE.

dagwaremedia Author

Level 1

30 points

May 10, 2025 8:07 AM in response to Grant Bennet-Alder

Great to know, I need a lot of storage so adding a 16TB sata to the 8TB thats there already should do fine for now.

Thx for the info.

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Mac Pro 2019 Pegasus J2i Enclosure questions