Icy Dock ExpressCage MB741V4P-B 3.5-Inch Bay Enclosure for 1xU.2/U.3 NVMe SSD

Icy Dock introduces the ExpressCage MB741V4P-B engineered to provide enterprise-grade U.2 and U.3 NVMe SSD integration in any standard 3.5″ device bay.

Designed with the company’s signature ExpressTray, it offers completely tool-less SSD installation for quick drive swaps, while retaining the stability of a tray-and-screw mounting system for long-term use in demanding environments. Supporting PCIe 4.0 x4 interface with transfer speeds of up to 64Gb (host dependent), the MB741V4P-B delivers the high-bandwidth performance required for servers, workstations, and IPC systems handling frequent drive access, high-speed data transfer, and mission-critical workflows.

Space Saver for 3.5″ Bay Installations

By utilizing a single external 3.5″ bay, the MB741V4P-B maximizes space efficiency in compact systems. It is for small-form-factor PCs, embedded platforms, edge computing systems, in-vehicle PCs, and enterprise workstations where internal space is limited. When paired with an onboard NVMe port or an M.2-to-U.2 adapter, the MB741V4P-B can be connected without consuming valuable PCIe expansion slots – freeing them for GPUs, networking cards, or other system upgrades.

Tool-less SSD Installation with Broad Drive Compatibility

The ExpressTray allows users to install or remove a U.2/U.3 NVMe SSD in seconds- no tools required. Simply insert the drive into the tray, close the latch, and slide it into the enclosure. The tray supports both 7 and 15mm U.2/U.3 SSDs, while the bay design accommodates drives ranging from 5 to 15mm in height. This makes it a solution for environments where quick drive swaps and broad SSD compatibility are essential, such as IT maintenance, data recovery, or production workflows.

Additional Screw Mounting Flexibility

For systems operating in high-vibration environments or for users who prefer additional mechanical stability, the tray provides optional screw mounting points to secure the SSD firmly in place. This ensures reliable operation during transportation or in industrial deployments.

Drive Ejection and LED Indicator

An easy-access drive ejection button allows smooth tray removal without excessive force, while the front-panel LED provides instant visual feedback on drive power and activity status – helping users quickly monitor SSD operation.

Optimized Ventilation for Passive Cooling

The metal housing and strategically placed ventilation holes enhance natural airflow, ensuring that high-performance U.2/U.3 NVMe SSDs operate within optimal temperature ranges even under sustained workloads.

Next-Gen Connectivity with U.2 SFF-8639 Interface

The MB741V4P-B uses a U.2 (SFF-8639) connector to deliver both PCIe data lanes and power, ensuring compatibility with the latest U.2/U.3 NVMe SSDs. When paired with a SlimSAS or OCuLink-to-U.2 cable, it offers a clean and efficient connection path for high-speed enterprise storage integration.

Product Compatibility

The MB741V4P-B is compatible with motherboards, RAID/HBA cards, and M.2 adapters from major brands including Adaptec, Areca, Broadcom, HighPoint, Supermicro, and more. This compatibility gives you the freedom to choose from a wide range of hardware options, moving beyond the constraints of single-brand system configurations. (Information on more information on product compatibility)

To simplify upgrade process even further, visit our

NVMe Storage Selection Tool – an interactive guide that helps you find compatible mobile racks, cables, and adapters based on your system’s NVMe slot type and installation needs. Perfect for system integrators and DIY users alike, it eliminates the guesswork from building your ideal removable NVMe storage solution.

Key Features:

• Fits in a single external 3.5″ device (floppy) bay
• Supports 1×U.2/U.3 NVMe SSD (7mm or 15mm height; bay supports up to 15mm)
• PCIe 4.0 x4 interface supports up to 64Gb transfer speeds (host dependent)
• ExpressTray with tool-less SSD installation and optional screw mounting for added stability
• Compatible with onboard NVMe ports or M.2-to-U.2 adapters without occupying PCIe slots
• Easy-access drive ejection button for quick removal
• Metal housing with ventilation holes for optimized passive cooling
• Housing-integrated locking latch to prevent accidental drive removal
• LED indicators for drive power and activity status
• Removable drive tray design for quick drive replacement
• Backed by an Industry-leading 3-year limited warranty against all defects

Specs: