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ATTO ExpressSAS R644 - Serial ATA/600, 6Gb/s SAS - PCI Express 2.0 x8 - Plug-in Card - RAID Supported - 0, 1, 4, 5, 6, 10, 50, JBOD, 60, 40, DVRAID RAID Level - 8 Total SAS Port(s) - 4 SAS Port(s) Internal - 4 SAS Port(s) External

ATTO ExpressSAS R644 - Serial ATA/600, 6Gb/s SAS - PCI Express 2.0 x8 - Plug-in Card - RAID Supported - 0, 1, 4, 5, 6, 10, 50, JBOD, 60, 40, DVRAID RAID Level - 8 Total SAS Port(s) - 4 SAS Port(s) Internal - 4 SAS Port(s) External
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Product Information


The ExpressSAS R644 RAID adapter provides 6Gb/s SAS/SATA connectivity to Direct Attached Storage via 4 external and 4 internal ports. With transfer rates of up to 1200MB/s per port, the R644 is well suited for high-bandwidth workflows, such as digital content creation, streaming video and audio, transactional databases, and email and Web servers.

The R644 combines advanced engineering and innovative features to ensure smooth data transfers and consistent performance. Leveraging ATTO's market-tested RAID stack and exclusive latency management features, the R644 helps customers create, share and protect data and digital assets more effectively.

  • Total Number of SAS Ports 8
  • Number of SAS Ports (Internal) 4
  • Number of SAS Ports (External) 4
  • Product Type SAS Controller
  • Manufacturer Part Number ESAS-R644-000
  • Manufacturer Atto Technology
  • Product Model R644
  • Product Name ExpressSAS R644
  • Product Line ExpressSAS
  • Brand Name ATTO
  • Package Contents
    • ExpressSAS R644 4-port SAS RAID Controller
    • Full-height Bracket
  • Platform Supported PC
  • Platform Supported Mac
  • Country of Origin United States
  • Environmentally Friendly Yes
  • Environmental Certification RoHS-6
  • Weight (Approximate) 1.20 lb
  • Form Factor Plug-in Card
  • Height 2.7"
  • Host Interface PCI Express 2.0 x8
  • RAID Levels 60
  • RAID Levels 40
  • RAID Levels DVRAID
  • RAID Levels 4
  • RAID Levels 5
  • RAID Levels 6
  • RAID Levels 10
  • RAID Levels 50
  • RAID Levels JBOD
  • RAID Levels 0
  • RAID Levels 1
  • Width 6.6"
  • Controller Type Serial ATA/600
  • Controller Type 6Gb/s SAS
  • RAID Supported Yes
  • Limited Warranty 3 Year


Brand Atto Technology
Manufacturer Atto Technology
MPN ESAS-R644-000
Base SKU 301005546-08
UPC 603175007234

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Usually delivers in 3 - 10 business days after shipment

Return and Tax Policies

Return Policy:
Returns must be initiated within 14 days of the delivery date. However, physical damage must be reported within 24 hours upon delivery. Returns will not be authorized outside of this allotted time period.
You must contact us to request a Return Merchandise Authorization. The product must be shipped back within 14 days of receiving your RMA #.
All returns must have prior authorization and a valid RMA #. Packages returned without prior authorization will not be accepted!
Returned items must be in original condition, with sealed packaging, completely unused. The customer assumes liability for the package until it arrives back at our location, and is responsible for all shipping costs.
Refunds will be processed within 3 business days upon arrival of returned merchandise. All Returns are subject to 15% restocking fee.
Made PC reserves the right to reject returned products after inspection (i.e. physical damage, incomplete packaging, etc.). If physical damage occurred during return shipping, we will notify the customer promptly. It is the customer's responsibility to contact the carrier and start a damage claim immediately. Made PC will keep damaged returns for 10 weeks; after that time period Made PC will dispose of items locally without issuing credit or further notice.

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