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The 2TB Pegasus J4 2.5" Thunderbolt External RAID Enclosure with 4 SATA HDDs from Promise Technology is a disk array with four 2.5" SATA 500GB 5400rpm hard disk drives installed, for a total data storage capacity of 2TB. Instead of these drives, the system could support optional 7200rpm HDDs or SSDs (solid state drives).
The array is equipped with two Thunderbolt 10Gb/s interfaces (cables sold separately) and delivers data transfer speeds of up to 386.82MB/s read and 385.21MB/s write. It can be set up in a variety of RAID backup configurations, including RAID 0, 1 and JBOD, giving you the flexibility to choose higher data storage capacity or greater data protection.
The system supports daisy chaining up to 6 Thunderbolt-compatible devices. It is compatible with Mac OS X 10.6.8, 10.7.4, 10.7.5, 10.8 and 10.8.2, and supports Time Machine. The enclosure is constructed from durable, lightweight aluminum.
Data storage capacity of 2TB, with four 500GB 5400rpm SATA hard disk drives installed. The system could also support optional 7200rpm HDD's or SSDs (solid state drives)
Connects to a computer via two Thunderbolt 10Gb/s interfaces (cables sold separately). Delivers up to 386.82 MB/s read speeds and 385.21 MB/s write speeds with the included drives
Choose from a variety of RAID backup configurations, including RAID 0, 1 and JBOD, giving you the flexibility to choose higher data storage capacity or greater data protection. RAID 0 offers no redundancy, so it gives you the least amount of data protection, but offers improved performance and additional storage (100% capacity). RAID 1 creates an exact copy (mirroring without parity or striping) of a set of data on 2 or more disks, for increased protection but reduced capacity and transfer speed. JBOD is Just a Bunch of Disks, offering no redundancy and therefore very little protection. Each disk is accessed directly as an independent drive. It differs from RAID 0 in that it does not truncate the other drives to the size of the smallest disk in the array. The hard drive array supports daisy chaining up to 6 Thunderbolt-compatible devices, meaning you can combine high levels of data protection with high capacity and transfer speeds by configuring 2 daisy chained J4 arrays in a RAID 10 (RAID 1 + RAID 0)
Combine with a Mac mini to create a cost-effective server-storage solution. Benefit from the freedom to add more devices when you require additional storage capacity
Compatible with Mac OS X 10.6.8, 10.7.4, 10.7.5, 10.8 and 10.8.2. Supports Time Machine
Constructed from durable, lightweight aluminum
In the Box
Promise Technology 2TB Pegasus J4 2.5" Thunderbolt External RAID Enclosure with 4 SATA HDDs
2.5" SATA 500GB 5400rpm Hard Disk Drives
Limited 2-Year Warranty
Table of Contents
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2.0 TB (4 x 500 GB)
Drive Types Supported
2.5" (6.35 cm) SATA hard disk drives and solid state drives
4: 2x per Thunderbolt port
Data Transfer Rate
Up to 386.82 MB/s read, 385.21 MB/s write
Video Stream Playback
PCI Express (PCIe) expansion bus protocol integrated with DisplayPort protocol for simultaneous data transmission and video output
RAID 0, 1 and JBOD Combinations possible via daisy chaining
HDD LED and Thunderbolt connections LED
Input and Output Connectors
2x Thunderbolt 10 Gb/s interfaces (cables sold separately)
Yes, located on bottom of unit
Not specified by manufacturer
Mac computer with OS X 10.6.8, 10.7.4, 10.7.5, 10.8 or 10.8.2 and Thunderbolt port: MacBook Pro 13", MacBook Pro 15", MacBook Pro 17", iMac 21", iMac 27", MacBook Air, or Mac mini Display monitor: Apple LED Thunderbolt, Apple
LED Cinema, Dell UltraSharp U3011, Philips 273P3LPHEB/96 Not Windows compatible
SATA hard drives: Hitachi 750GB Travelstar 7K750 (model #HTS727575A9E364) with 0D0 firmware Seagate 250GB Momentus Thin (model #ST9250LT003) with 0001SDM1 firmware, 500GB Momentus XT (model #ST95005620AS) with SD26 firmware, and 750GB Momentus (model #ST9750420AS) with 0001SDM5 firmware Toshiba 750GB MQ01ABD (model #MQ01ABD075) with 1U firmware and 500GB MQ01ABD (model #MQ01ABD050) with 01A firmware SSD drives: Toshiba 240GB THNSNS Series (model #THNSNS240GBSP) with TPCABBF0 firmware Intel 240GB 520 Series (model #SSDSC2CW2400A3) with 400i firmware, 120GB 510 Series (model #SSDSC2MH120A2) with PPG4 firmware, and 300GB 320 Series (model #SSDSA2BW300G3) with 4PC10302 firmware Samsung 256GB 830 series (model #MZ-7PC256) with 2B1Q firmware
Power adapter (included)
1.65 x 7.9 x 7.9" (4.2 x 20.1 x 20.1 cm)
5.29 lb (2.4 kg) with HDDs 3.53 lb (1.6 kg) without HDDs