description Promise Pegasus R4 Overview
Promise Pegasus R4 is a high-performance, hot-swappable storage array utilizing flash memory and traditional hard drives for scalable data protection and availability solutions across diverse workloads.
help Promise Pegasus R4 FAQ
What does the R4 mean in Promise Pegasus R4?
R4 refers to a four-drive storage enclosure. The original Pegasus manual describes four 3.5-inch SATA hard drives connected through a hardware RAID engine. [Promise manual](https://www.promise.com/media_bank/Download%20Bank/Utility/Pegasus%20User%20Manual%20%28English%29.pdf)
Is every Promise Pegasus R4 an all-SSD array?
No. The R4 name identifies the four-drive design, not the storage medium, and the original manual documents hard-drive configurations such as 4 TB and 8 TB raw capacity. Later Pegasus generations can use different drive types, so the exact model label matters. [Promise manual](https://www.promise.com/media_bank/Download%20Bank/Utility/Pegasus%20User%20Manual%20%28English%29.pdf)
What does hot-swappable mean on the Pegasus R4?
It means a failed drive can be removed and replaced through its drive bay without shutting down the entire enclosure, provided the array and management software support the operation. Hot swapping improves availability, but RAID is not a backup against accidental deletion or corruption.
What connection does the original Pegasus R4 use?
The original R4 uses a Thunderbolt connection rated in the manual at 10 Gb/s and is managed with Promise Utility. A modern Windows computer with Thunderbolt 3 or 4 may still require the right adapter, driver, and firmware combination. [Promise manual](https://www.promise.com/media_bank/Download%20Bank/Utility/Pegasus%20User%20Manual%20%28English%29.pdf)
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