The Adata SD810 is a sleek, high-performing external USB SSD that offers 20Gbps speeds. It comes in a slim and attractive form factor and is competitively priced, especially the 4TB capacity option. While it excelled in most of our tests, it did experience a significant slowdown during a 450GB write due to secondary cache exhaustion. This may only impact a rare subset of users, so for the average user, the SD810 is a great choice.
The SD810 features USB 3.2×2 connectivity, measuring around 2.84 x 1.72 x 0.48 inches and weighing 1.4 ounces. It offers solid read performance, likely using NVMe technology with QLC NAND for the storage. Adata provides a five-year warranty for peace of mind.
Pricing for the SD810 ranges from $60 for 500GB to $340 for 4TB, with the latter being a particularly attractive deal. While it may not be the best option for heavy video editing due to its slower write speeds once the secondary cache is depleted, it performs well for everyday tasks.
In our tests, the SD810 showed strong performance in most areas, with good random 4K speeds and satisfactory results in 48GB transfers. However, it struggled in the 450GB single-file write test, dropping to around 250MBps once the secondary cache was exhausted.
Overall, the Adata SD810 is a solid choice for those looking for a fast and affordable USB SSD. It may not be the absolute fastest option out there, but for the average user, it offers good performance at a reasonable price. Just keep in mind its limitations with heavy, sustained writes.
