1. R27A is suitable for use with U.2 hard disks. R27B is applicable with U.3 hard disk.
  2. R27C works with E1.S hard disk and E3.S hard disk. R27A,R27B and R27C Do Not compatible with each other, can`t be mixed.
  3. U.2 and U.3 interfaces look the same but have different pin definitions and cannot be mixed, so please be careful to recognize them.
  4. Speed Bandwidth: PCIe 5.0/4.0 x4, Compatible with Gen3/Gen4/Gen5. Bandwidth: R27A,R27B is PCIe 4.0 x4, R27C is PCIe 5.0 x4.
  5. R27A and R27B Light: D2 light for the power indicator, D1 light for reading and writing light, under normal circumstances, D1 light is always on, D2 light reading and writing state will blink.