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Promise Pegasus R4 - 4TB RAID System - PR401US

Pegasus R4 is the First 4-bay High Performance Hardware RAID Solutions designed to unleash the raw power of Thunderbolt technology.   Learn more about the product
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eCOST Part#: 8859210
Mfr Part#: PR401US
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Platform: Universal
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Pegasus RAID Storage with Thunderbolt
Designed to unleash the raw power of Thunderbolt technology.

Pegasus - Direct Attached Storage
Pegasus R4 and R6 are the First 4-bay and 6-bay High Performance Hardware RAID Solutions designed to unleash the raw power of Thunderbolt technology. Thunderbolt technology is a new, high-speed, dual-protocol I/O technology designed for performance, simplicity, and flexibility. This highspeed I/O technology is capable of delivering a blistering two channels of 10 Gb/s (1.25GB/s) per port of performance.

Pegasus R4
  • 4 Bay Hot-swappable Direct Attached Storage with Thunderbolt technology
  • RAID 0, 1, 6, 5, 10

PROMISE Pegasus R Series 4-bay with 4x 1TB or 2TB SATA HDD High Performance Hardware RAID Solutions featuring Thunderbolt technology.

Enabling Connectivity to the Mac World

PROMISE is committed to developing the best-in-class storage solutions for Mac OS X users. From the A/V professional needing enterprise class storage to the home user requiring external desktop storage, PROMISE provides proven storage solutions for your storage infrastructure.

Introducing Thunderbolt Technology

Thunderbolt technology is a new high-speed, multi-protocol I/O technology providing dual channel, bidirectional 10Gb/s data transfer rate, while integrating the display protocol, allowing users to use a single cable for data transmission and video output. Thunderbolt technology provides the incredible 10Gb/s speed which is much more faster than other existing I/O technologies. Benefit from Thunderbolt technology, users can now transmit Teras and Gigas of data in a flip, and for creative professionals can utilize the large bandwidth to enhance the effectiveness of HD video editing.

Device Type Hard drive array
Installed Devices / Modules Qty 4
Supported Devices / Modules Qty 4
Supported Drives SATA-600
Total Array Capacity 4 TB
Max Supported Capacity 8 TB
HDD Array External Interface Thunderbolt
Storage Controller
Interface Type SATA 6Gb/s
Data Transfer Rate 600 MBps
Cache / Buffer Size ( Max ) 512 MB
Hard Drive
Type Hot-swap - plug-in module hot-swap
Capacity 4 x 1 TB
Spindle Speed 7200 rpm
Expansion / Connectivity
Expansion Bays 4 (total) / 0 (free) - 3.5" - hot-swap
Interfaces 2 x Thunderbolt
System Requirements
OS Required Apple MacOS X 10.6 or later
Compliant Standards UL, C-Tick, BSMI, cUL, CB, FCC, RoHS, WEEE, UL 2464, EuP Ready
Power Device Internal power supply
Voltage Required AC 120/230 V - 50/60 Hz
Power Provided 250 Watt
Dimensions & Weight
Width 7.4 in
Depth 9.3 in
Height 7.7 in
Weight 9.9 lbs
Manufacturer Warranty
Service & Support 2 years warranty
Service & Support Details Limited warranty - 2 years
Environmental Parameters
Min Operating Temperature 41 °F
Max Operating Temperature 95 °F
Humidity Range Operating 10 - 85%
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Promise Pegasus R4 - 4TB RAID System (PR401US)

Pegasus R4 is the First 4-bay High Performance Hardware RAID Solutions designed to unleash the raw power of Thunderbolt technology.

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