SOLVED: Second HDD not getting detected in MacBook Pro Mid 2012 - MacBook Pro 13" Unibody Mid 2012 - iFixit
![Amazon.com: 2nd HDD SSD Hard Drive Caddy for Apple MacBook Pro Unibody Mid-2012 A1278 13-Inch Laptop MD101LL/A MD102LL/A MD101 MD102, SATA3 Second Solid State Drive Enclosure, CD DVD SuperDrive Optical Bay New : Amazon.com: 2nd HDD SSD Hard Drive Caddy for Apple MacBook Pro Unibody Mid-2012 A1278 13-Inch Laptop MD101LL/A MD102LL/A MD101 MD102, SATA3 Second Solid State Drive Enclosure, CD DVD SuperDrive Optical Bay New :](https://m.media-amazon.com/images/I/61k5szPijsL.jpg)
Amazon.com: 2nd HDD SSD Hard Drive Caddy for Apple MacBook Pro Unibody Mid-2012 A1278 13-Inch Laptop MD101LL/A MD102LL/A MD101 MD102, SATA3 Second Solid State Drive Enclosure, CD DVD SuperDrive Optical Bay New :
![2.5" 9.5mm Sata 2nd Hdd Ssd Hard Drive Caddy Adapter For Macbook Pro Unibody A1278 A1286 A1297 Cd Rom Optical Bay - Pc Hardware Cables & Adapters - AliExpress 2.5" 9.5mm Sata 2nd Hdd Ssd Hard Drive Caddy Adapter For Macbook Pro Unibody A1278 A1286 A1297 Cd Rom Optical Bay - Pc Hardware Cables & Adapters - AliExpress](https://ae01.alicdn.com/kf/H397870b26f1b4704a185726870bee0fbO/2-5-9-5mm-SATA-2nd-HDD-SSD-Hard-Drive-Caddy-Adapter-For-MacBook-Pro-Unibody.jpg)
2.5" 9.5mm Sata 2nd Hdd Ssd Hard Drive Caddy Adapter For Macbook Pro Unibody A1278 A1286 A1297 Cd Rom Optical Bay - Pc Hardware Cables & Adapters - AliExpress
![Second HDD Caddy 2nd SATA 2.5" Hard Disk Drive SSD 9.5mm Enclosure for Apple Macbook Pro Air A1278 A1286 A1297 DVD CD ROM Bay | Wish Second HDD Caddy 2nd SATA 2.5" Hard Disk Drive SSD 9.5mm Enclosure for Apple Macbook Pro Air A1278 A1286 A1297 DVD CD ROM Bay | Wish](https://canary.contestimg.wish.com/api/webimage/5aac6dff54557819d995f3c3-large.jpg?cache_buster=575893b7f7541839ff8a9a05dfa90da9)
Second HDD Caddy 2nd SATA 2.5" Hard Disk Drive SSD 9.5mm Enclosure for Apple Macbook Pro Air A1278 A1286 A1297 DVD CD ROM Bay | Wish
![9.5mm Aluminum 2nd Second HDD Caddy 3.0 for MACBOOK Pro A1278 A1286 A1297 SSD DVD Enclosure Adapter Hard Disk Dropship - AliExpress 9.5mm Aluminum 2nd Second HDD Caddy 3.0 for MACBOOK Pro A1278 A1286 A1297 SSD DVD Enclosure Adapter Hard Disk Dropship - AliExpress](https://ae01.alicdn.com/kf/S38d4c478ab7d496ba895a8f5143524a8E.jpg_640x640Q90.jpg_.webp)
9.5mm Aluminum 2nd Second HDD Caddy 3.0 for MACBOOK Pro A1278 A1286 A1297 SSD DVD Enclosure Adapter Hard Disk Dropship - AliExpress
![Amazon.com: Nimitz 2nd HDD SDD Hard Drive Caddy for MacBook Pro Unibody with External USB Enclosure : Electronics Amazon.com: Nimitz 2nd HDD SDD Hard Drive Caddy for MacBook Pro Unibody with External USB Enclosure : Electronics](https://m.media-amazon.com/images/I/4131xiYrtKL._AC_UF894,1000_QL80_.jpg)