RSS639 JBOD Rugged 6U Storage System

  • Designed to MIL-STD 810, 167-1, 461 and MIL-S-901
  • Up to 39 top-loading, hot-swappable, rugged HDD
  • NAS capable
  • 20" depth 

RSS639 Rugged 6U Storage System

  • Rugged 6U, rack mounted 20" depth, easily mounted on Jonathan® rails
  • Rear I/O offers four (4) SFF-8088 SAS connections
  • N+1 power supply
  • Offers maximum airflow with six (6) high speed, high volume low noise fans
  • Versatility with up to thirty-nine (39) 3.5" HDDs, top load drive design, up to 156 TB
  • All aluminum construction - 160-175 lbs.

 ** If you are logged in please click on the Documents tab to view our documentation for this product.

High Density Storage
In an industry where 28” chassis depths are common, Crystal Group provides a storage system that is 20” deep with the latest capabilities. With an all aluminum chassis weighing in at 160-175 lbs., the RSS639 provides significant storage in a small package. 

Rugged and Dependable
Using our expertise in avionics design and development, we’ve created the next generation in rugged storage. This game-changing technology provides enhanced storage power in the harshest of environments. We do not just design to these standards, we actually test to them. When we put our name on the RSS639, you can be sure it is both rugged and dependable.

High Reliability at a Fraction of the Cost
Innovative packaging techniques and attention to the important details makes our product run cooler and perform at wider temperature extremes. Design approach limits deflection and extends circuit board solder joint life. We provide incredible storage, in a rugged package, with exceptional life at a fraction of the cost.

Testing Standards *register to download for certification reports

Environmental Standards

MIL-STD-810, Operational Temperature, Method 501/502 Procedure I/II

-15°C to +50°C,
-40°C operational with SSD

MIL-STD-810, Storage, Method 501, Procedure I/II -55°C to +85°C
MIL-STD-810, Humidity, Method 507, Procedure II 240 hours with humidity kit
MIL-STD-810, Altitude, Method 500 12,500ft operation, 40,000ft transport
MIL-STD-810, Vibration, Method 514, Procedure I 3 GRMS, 5-500Hz, 75 min/axis, with SSDs
MIL-S-901, Grade B, Class 2, Type B With solid state drives + vibration kits

Electromagnetic Compatibility Standards

Some standards may require an internal kit

FCC Class A

Mechanical (6U) 


10.5” (26.67 cm)


17.5” (44.45 cm) EIA-310 Rack Compliant


20.125” (51.12 cm) 


160-175 lbs. (72.58-79.38 kg) (with 3.5" drives)

External Bays (39) 

Thirty-nine (39) top-loading, hot-swappable, rugged 2.5” or 3.5” HDDs


Six (6) High speed, thermostatically controlled, low noise fans


Jonathan rails

Power Supply

1350W 120/240VAC 50/60Hz N+1 w/PFC, 115VAC 400Hz

Export Compliance

ECCN: 5A992

Classification is dependent on configuration and is subject to change. Please contact your Business Development Manager to receive the classification of your product.

* Crystal Group designs all storage systems to meet or exceed the specifications listed herein. Due to the sheer number of models and combinations of components, it is not practical to test every combination of systems offered. Please ask your Crystal Business Development Manager for data on qualification testing for configurations similar to the desired configuration for your application.

This product is currently deployed on the following program:

Gorgon Stare for the US Air Force 

Supporting Documentation Download
RSS639 - Spec Sheet download
More Documentation Download
RSS639 Storage System- Outline Installation Drawing download
RSS639 Hardware Guide download