Features: 1.For integrated LSI SAS 2008 main control chip with 4 standard 6GB SATA / for SAS interfaces, it supports for SAS hard disk. 2.Maximum single disk capacity supports 8TB and it can connect four SATA or for SAS hard disks. 3.4 interfaces can reach 6GB full speed at the same time. And the quality is guaranteed. 4.IR and IT modes are optional, and HBA extension is supported in IT mode, further more, for RAID 0, 1 is supported in IR mode. 5.Short bezel design is for low chassis and servers, thus, you can use it with confidence. specification:Item Type: Disk array card Interface: PCI-E x8 / x16 Support Hard Disk: Support 8TB hard disk, including SATA and for SAS; it can connect fourhard disks at the same time, which means that this card can hang up to 4 x 8TB=32TB capacity. Number of Hard Disk Interfaces: 4 Chipsatz: LSI for SAS 2008 RAID-Level: 0/1 Compatible System: For Windows10 / 8 / 7 comes with a plug-and-play driver, for Win7 pure system and for XP need to manually install the driver, support for synology 5.2/6.0/6.1 (black skirt), and no need to install any driver, directly recognize the disk. Working Mode (Dual modes are optional) Working Mode 1: IR mode Working Mode 2: IT mode (P20 version latest firmware) Size: Approx.170 x 120 x 20mm / 6.7 x 4.7 x 0.8 in PackageList:1 xRAIDCard NoteProduct status: open box, pull from server, not brand new. What is the difference between the IT and IR modes for the firmware of the LSI HBA card? 1. The two firmware types are Initiator Target (IT) and Integrated RAID (IR). IR is the typical hardware RAID firmware that the internal cards or boards ship with. 2. 1) The IT firmware, on the other hand, is the initiator target firmware which is designed to allow a for SAS HBA to connect to up to 256 devices using for SAS expanders. 2) The IT firmware is typically shipped on external cards. 3) The IT firmware does not have any RAID capabilities and simply acts as an HBA.