NGFF M.2 NVME SSD Convert Card Interface: M.2 NGFF Apply to: AHCI Protocol 2280 PCIe x4 M.2 NGFF，A1465 A1466 A1502 A1398 M.2: M Key Compatible with: 2013 2014 2015 MACBOOK Air Mac Pro the reasons for not recognizing the disk are summarized as follows: 1. The card adapter is not inserted into the socket of the SSD computer. 2, the hard drive is wrong, some buyers use the NGFF M.2 protocol SATA hard drive to install, pls help to check your hard disk protocol and send a photo to us. 3, the system installation disk should use version 10.13.6 or higher，choose GPT (GUID) partition format. 5, pls do not install the system from the network, do not try to use your original backup to restore the system, because the old and new versions of the Apple system disk format is not the same. Download the Apple system, make a 10.13.6 Apple disk system installation, install from USB disk. 1. Support Following M.2 (NGFF) PCIE-AHCI SSD: Samsung XP941/SM951(MZHPU128HCGM MZHPU256HCGL MZHPU512HCGL) Kingston SHPM2280P2 / 240G / 480G The following NGFF PCIe SSD does not support: SMIE PCIE-NVME/PCIE-NVME PM951 (MZVPV128HDGM MZVPV256HDGL MZVPV512HDGL),and other PCIE-NVMe SSDs. 2.please turn off the sleep function of the system after installing the operating system. Colour:Green Material:Metal & PC Package Contents: 1*NGFF M.2 NVME SSD Convert Card Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.