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Black plastic internal drive bay adapter holding two 2.5 inch drives in a 3.5 inch form factor

DELL

DELL R494D 2.5" to 3.5" Drive Bay Adapter

SKU CH-NKSD-FMMDS

Converts a 3.5" bay to hold two 2.5" drives for compatible Dell Optiplex and Precision systems

  • Fits two 2.5" drives in a single 3.5" bay
  • Plastic construction keeps weight low for easy installation
  • Designed for Dell OptiPlex 960 980 990 and 790 systems
  • Compatible with Precision T3500 T5500 T5600 workstations
  • Dell part R494D ensures correct mounting alignment

Dell R494D Drive Bay Adapter

The Dell R494D adapter lets you install two 2.5" drives into a single 3.5" internal bay. It is built for IT teams maintaining compatible Dell Optiplex and Precision workstations that need extra storage density without replacing the chassis.

Sustained operation in a fixed bay

The plastic frame holds both drives securely so vibration stays low during continuous read and write cycles. Because the adapter mounts directly into the 3.5" bay, airflow follows the original system design and no extra cooling changes are required.

Plastic construction and tool-less intent

The moulded plastic body keeps weight near 8 oz and slides into the bay without rails or screws on most listed models. Compatibility covers Optiplex 960, 980, 990, 790 and Precision T3500, T5500, T5600, so buyers with other Dell or non-Dell systems cannot use this adapter.

Highlights

  • Fits two 2.5" drives in a single 3.5" bay
  • Plastic construction keeps weight low for easy installation
  • Designed for Dell OptiPlex 960 980 990 and 790 systems
  • Compatible with Precision T3500 T5500 T5600 workstations
  • Dell part R494D ensures correct mounting alignment

Specifications

BrandDell
ModelR494D

Questions about this item

Does the plastic adapter generate any extra heat or noise when a 2.5" drive runs continuously inside a 3.5" bay?

The R494D is a passive plastic caddy with no fan or electronics, so it adds no heat or noise beyond the drive itself.

What mounting hardware must I already have to secure a 2.5" drive into the R494D and then into my chassis?

You need the four M3 screws for the 2.5" drive and the standard 3.5" bay screws or tool-less rails that your Dell system uses.

Will the R494D fit the drive bays in my older Precision T3500 and Optiplex 960 without modification?

Yes, the adapter is listed as compatible with Precision T3500, T5500, T5600 and Optiplex 790, 960, 980, 990.

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