Old MacBook Pro repair. Back when you could upgrade the SSD and Ram! : r/mac
2TB MacBook Pro Hard Drive A1278 A1286 A1297 replacement
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How to install SSD in MacBook Pro A1278 | Hard Drive replacement - YouTube
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1 Pc Hard Disk Drive Adapter SSD HDD Caddy For Apple-MacBook Pro A1278 A1286 A1297 R9JA 9.5/12.7mm 2 Optional Sizes
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 :
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Padarsey 2nd HDD SSD Hard Drive Caddy Tray Replacement for MacBook Pro 13/15/17 A1278 A1286 A1297 2008-2012 2.5 Inch 9.5MM - AliExpress