Mediasonic 4 Bay Dock for 2.5" / 3.5" SATA HDD/SSD - USB 3.0 & eSATA Support 12TB HDD (HFD1-SU3S2) Individual bay slot design supports up to 4 x 2.5" / 3.5" HDD / SSD. Support up to 4 different brand / capacity / model / form factor HDD running concurrently Support USB 3.0 up to 5.0 Gbps and eSATA up to 6.0 Gbps Support 2.5 and 3.5 SATA I / II / III hard disk drive up to 12TB. Individual power on/off button for each hard drive slot. Hot-Swap with eSATA connection only. USB 3.0 connection does NOT support Hot-Swap. Support UASP and S.M.A.R.T. Special design suction feet for steadily use on a desktop.