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

  • Last Post 21 October 2022
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.


Order By: Standard | Latest | Votes
sa a posted this 21 October 2022

Hi Jason

Is everything still working? Also planing to update to 18TB but was planing to buy seagate, because there are cheaper than your Western Digital, thougts?

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

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