Description:The iStarUSA GAGE104U40SL-SAUF-RM 1U Trayless Hard Drive Enclosure is designed to give you the space you need to build the system you want. This enclosure supports up to four 3.5" SATA I/II hard disk drives and offers support for USB 3.0, eSATA, FireWire400, and FireWire800 connections. With three 40mm silent cooling fans, the iStarUSA GAGE104U40SL-SAUF-RM 1U Trayless Hard Drive Enclosure works silently and efficiently for your benefit.Features: Supports 3TB HDDs Data Transfer Speed up to 300MB/s Trayless and Tool-free Design for HDD Installation. Smooth HDD Release Mechanism Design. Plug and Play.