Promise2 R8 and R6 18TB hard drive success...

  • Last Post 13 March 2021
Jason Barton posted this 05 March 2021

I've seen a lot of people asking what the max hard drive size that can be put into the Promise2 units. I successfully replaced all the drives in my R8 and R6 with 18TB drives. Disk model specifics below if anyone is interested:

WD Ultrastar DC HC550 WUH721818ALE6L4 0F38459 18TB drives

The wizard would not complete the setup in the Promise Utility, but manual configuration worked just fine. I spent the last 3 days copying data off of older units to the newly upgraded units, zero issues.


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Ranjith kumar posted this 08 March 2021

Hi Jason,

Thank you sharing valuable information. 

Also users can refer below Pegasus2 compatibility list for drives model:

Thank you,


Promise Team

坤 钟 posted this 13 March 2021

With such a large and expensive hard drive, it will be troublesome if you lose a lot of data. Anyway, thank you for sharing