Dell 400-BKFR 3.84TB NVMe PCIe 4.0 U.2 Read Intensive SSD Express Flash

The Dell 400-BKFR is a Dell-branded 3.84TB Enterprise NVMe read-intensive SSD in the 2.5-inch U.2 form factor with a PCIe 4.0 x4 interface. Dell sells it for PowerEdge servers as a drive with carrier, and resellers often describe it as an Express Flash drive. Reseller kits pair the drive with the Dell DXD9H 2.5-inch tray and mounting screws. The drive's Dell part number (DPN) is 21RRY, which is the number printed on the drive label and used for service matching.

As a read-intensive model, the 400-BKFR fits PowerEdge workloads where reads dominate: virtualization datastores, VDI boot and user volumes, web and application servers, analytics and database read replicas. Dell did not publish a DWPD figure or performance numbers in the sources checked, and Dell does not name the underlying drive manufacturer for this SKU. If you need specific IOPS or endurance numbers, ask for the DPN and firmware on the unit offered and compare them with Dell's documentation. For write-heavy work, look at Dell's mixed-use NVMe SKUs instead.

NVMe drives in PowerEdge servers need an NVMe-capable drive backplane, or a universal backplane with NVMe enabled, plus the matching cabling or PERC/HBA path. A chassis built only for SAS/SATA will not see this drive, even if the tray fits. The DXD9H style tray is used on recent PowerEdge generations. Older servers with a different tray design will need the right carrier.

• Confirm your PowerEdge model and backplane support NVMe U.2 drives in the bays you plan to use.
• Check whether your configuration calls for 400-BKFR (Enterprise NVMe) or another Dell 3.84TB NVMe SKU such as the Data Center NVMe drives, which use different part numbers.
• Match the DPN 21RRY on the label when replacing a failed drive.