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ESAS-R644 8 Port PCIe to 6Gbit/s SAS RAID-Controller


The ATTO ExpressSAS R644 low-profile RAID Adapter provides 6Gbit/s SAS/SATA II connectivity and delivers blazing-fast performance with transfer rates of up to 9.6GB/s throughput in full-duplex mode. Featuring integrated RAID support, 8 external ports and PCIe bus technology, the ExpressSAS R644 is engineered for the most demanding digital media and IT server applications.

The easy-to-use GUI-based utility enables RAID management, monitoring, and configuration. ATTO also incorporates its exclusive Advanced Data Streaming (ADS) Technology to meet the most demanding performance requirements. With ADS Technology data is moved faster and more efficiently with reduced CPU utilization.

ATTO´s CacheAssure Technology is a Flash-based protection module providing a maintenance-free solution that safeguards against the loss of cached data during a power or system failure. The RAID-Controllers are available with or without CacheAssure (upgrade is possible).

Features and Benefits

  • 4 internal and 4 external ports (1x SFF-8087 and 1x SFF-8088)
  • 9.6GB/s throughput in full-duplex mode
  • Support for up to 256 6Gbit/s SAS/SATA end devices
  • 512MB Cache
  • Highly configurable RAID 0, 1, 4, 5, 6, 10, 40, 50, 60 and DVRAID
  • Advanced Data Streaming (ADS) Technology
  • Drive Assure Technology
  • CacheAssure Technology
  • Drivers support for Windows, Linux, Mac
  • 3-year standard product warranty

Technical Specifications

Model ATTO ESAS-R644-000 and ESAS-R644-C00 (including CacheAssure)
Adapter Architecture
Host Bus Type PCIe x8
Cache 512MB ECC protected
HDDs 256x 6Gbit/s SAS/SATA II
HDD Ports 1x SFF-8087 and 1x SFF-8088 for 4x int. and 4x ext. HDDs
Operating Systems
Supported OS Windows Server 2003, 2008, XP, Vista, 7
Mac OS X (10.4.x - 10.6.x)
Linux (Red Hat und SuSE)
RAID Level 0, 1, 4, 5, 6, 10, 40, 50, 60 und DVRAID
RAID Features online expansion
Environment Specification
Humidity 5%~95%, non-condensing
Operating Temperature 0°C~40°C
Form Factor Low Profile