Features: 1.Rear SATA3.0 interface: The new update extends the four rear SATA3.0 interfaces, which is more suitable for narrow spaces. 2U can also be better repaired from the back wiring, there will be no connection to the video card. 2.Universal 4U, 2U: this product is equipped with double fixed 4U, 2U brackets, which are supported by large or small housing. 3.Larger heat sink: better heat dissipation and more suitable for long working hours. 4.PCI-E interface: is easy to install into the PCI-EXPRESS slot of the case with thick gold plated PCI-E interface.Better contact and easy data transmission can effectively reduce data loss. 5.The tail is designed to be in one plane: the probability of blocking the fan of the video card is less. 6.Four-layer printed circuit board with middle insulation layer for stronger anti-interference capability. 7.Original mode selection: AHCI, IDE, data drive, three modes to choose from. Specification: Model: SA3004 Bus interface: PCI-E X1 (compatible with X4, X8, X16 or graphic interface) Number of interfaces: SATA3.0.4 interface System support: for Windows XP or 2003 or Vista or Win7 or Win8 or Win10 (32 or 64 bit) Size: approx. 120 x 65 x 56 mm, 4.7 x 2.6 x 2.2 inch (as shown in the pictures) Weight: approx. 89g Package list: 1 x Extensions tab 1 x 2U partition 2 x screw