The IW-RS216-07 supports three types of drive bays: 3.5"/2.5" (15mm) HDDs, 2.5"(15mm) SSDs and 2.5" (7mm) SSDs, bringing a wide range of storage combinations. More options to meet your storage preferences and increase/maintain efficiency. It also offers a choice of 2 x 2.5" SAS/SATA SSD drive bays at the rear of the chassis. The converter drive tray is compatible with either a 2.5" or a 3.5" drive.