The MB322SP-B employs a solid full metal chassis combined with industrial-grade ABS plastic. This construction offers significant physical protection against accidental impacts and vibration, commonly encountered in environments with active machinery or transport. The metal frame provides structural integrity, while the ABS plastic components help absorb minor shocks. This design also aids in heat dissipation from the drives, helping to maintain optimal operating temperatures, typically between 0°C and 55°C for most SAS/SATA drives, preventing thermal throttling.

The ExpressCage MB322SP-B features a SATA III interface, providing a maximum theoretical bandwidth of 6Gbps per drive. This is crucial for maximizing the performance of modern 2.5-inch SSDs and high-RPM SAS HDDs, ensuring that data transfer speeds are not bottlenecked by the enclosure. It supports both SAS (single-port) and SATA drives, offering broad compatibility. This is a significant upgrade over older SATA II (3Gbps) interfaces, allowing for faster file transfers and improved application responsiveness, particularly for sequential read/write operations exceeding 300MB/s.

The hot-swap capability allows users to insert or remove 2.5-inch SAS/SATA drives without shutting down the host system. This feature is invaluable for tasks requiring constant uptime, such as managing RAID arrays, performing urgent data backups, or swapping out drives for maintenance or capacity upgrades. The enclosure utilizes a standard 4-pin Molex power connector, ensuring a stable power supply necessary for reliable hot-plugging, which is critical to prevent data corruption or drive damage during these operations.