Host connection: USB-C & A USB 3.2 Gen 2. Downstream interfaces: CF Express Type-B, SD 4.0. Supports CF Express Type-B (max read/write 1250Mbps) and SD/SDHC/SDXC/UHS-I/II cards (max read 300Mbps, write 250Mbps). When connected to a PC/notebook, no drive appears until a card is inserted, then the drive letter shows for easy file access.