This X880 USB 3 to dual SATA Gen3 ports shield makes it easy to add high-capacity, high-performance external data storage to your Raspberry Pi 4.The dual SATA shield supports two 2.5" or 3.5" SATA hard drives with ultra-fast data transfer speeds and configurable RAID modes. This dual SATA shield delivers fast file transfer rates up to 5Gbps with USB 3.1 Gen 1 performance. It supports SATA I, II and III and is enhanced with UASP to maximize the performance and speed of your SATA III drives. The dual SATA shield provides an effective solution for Raspberry Pi 4 to store, access, back up, and protect important files.
A1 and A2
The A1 and A2 are two pcs PCB boards with positioning holes that use to hold the 2.5" or 3.5" HDD/SSDs to use with X880 board togehter. Also include 2pcs SATA 7+15pin Male to Female Cables.
A3 is the acrylic plates with 2mm thickness that use with metal case to hold the HDD/SSDs. It has the same function as A1-A2, can replace the A1-A2. But you will need 2pcs SATA 7+15pin Male to Female Cables.