This little guy is perfect for adding an SSD to an old laptop. this has already sped things up to madness. This is a standard SATA SSD that fits perfectly in most laptops and PCs. In this case, it was a simple swap and reinstall of macOS and you're done. I've tested Samsung before, but budget-wise this suits me better and works just as well as others I've done the same thing with. Very beautiful.
SAMSUNG 860 EVO 1TB Internal SSD (MZ-76E1T0E), 2.5-Inch SATA III, 1 TB Capacity
29 Review
ADATA SU800 256GB SSD: High Speed Read & Write, 3D-NAND, SATA III, 560MB/s & 520MB/s
27 Review
GIGABYTE SSD 240GB GP-GSTFS31240GNTD: Boost Performance with Lightning-Fast Storage
21 Review
Kingston A400 240GB SATA SA400S37/240G solid state drive
60 Review
π Seagate Expansion 3TB Portable USB 3.0 External Hard Drive (STEA3000400) in Black
60 Review
8TB Seagate Backup Plus Hub Desktop Hard Drive with Data Recovery Services
56 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review