SandForce SF-2281

The SandForce SF-2281 was the dominant SATA SSD controller of the 2011–2014 era, appearing in drives from nearly every major brand including OCZ, Corsair, Kingston, Intel, Patriot, and OWC. Manufactured on a 65nm TSMC process, it was the first consumer controller to deliver consistent 500 MB/s sequential reads over SATA III, almost fully saturating the 6 Gbit/s interface.

Its defining feature was DuraWrite, a hardware compression technology that reduced the amount of data physically written to NAND, improving both write endurance and performance. DuraWrite produced spectacular benchmark results with compressible data, but performance dropped sharply with incompressible data (such as already-compressed files, video, or encrypted content). This discrepancy made the SF-2281 controversial in reviews and led to benchmark methodology debates that shaped how SSDs are tested to this day.

The SF-2281 is DRAM-less. Instead of a dedicated cache DRAM, it relied on its internal SRAM and the compression engine to manage write operations. Enterprise variants added power-loss protection capacitors. The SAS-compatible SF-2282 variant was used in PCIe RAID cards such as the OWC Mercury Accelsior, and OCZ paired two SF-2281 dies in RAID on the RevoDrive x2 PCIe card.