- SATA 2.0

SATA revision 2.0 (3 Gbit/s, 300 MB/s, Serial ATA-300)

SATA 2 connectors on a computer motherboard, all but two with cables plugged in. Note that there is no visible difference, other than the labeling, between SATA 1, SATA 2, and SATA 3 cables and connectors.

SATA revision 2.0 was released in April 2004, introducing Native Command Queuing (NCQ). It is backward compatible with SATA 1.5 Gbit/s.

Second-generation SATA interfaces run with a native transfer rate of 3.0 Gbit/s that, when accounted for the 8b/10b encoding scheme, equals to the maximum uncoded transfer rate of 2.4 Gbit/s (300 MB/s). The theoretical burst throughput of the SATA revision 2.0, which is also known as the SATA 3 Gbit/s, doubles the throughput of SATA revision 1.0.

All SATA data cables meeting the SATA spec are rated for 3.0 Gbit/s and handle modern mechanical drives without any loss of sustained and burst data transfer performance. However, high-performance flash-based drives can exceed the SATA 3 Gbit/s transfer rate; this is addressed with the SATA 6 Gbit/s interoperability standard.

SATA revision 2.5

Announced in August 2005, SATA revision 2.5 consolidated the specification to a single document.

SATA revision 2.6

Announced in February 2007, SATA revision 2.6 introduced the following features:

Slimline connector.
Micro connector (initially for 1.8” HDD).
Mini Internal Multilane cable and connector.
Mini External Multilane cable and connector.
NCQ Priority.
NCQ Unload.
Enhancements to the BIST Activate FIS.
Enhancements for robust reception of the Signature FIS.

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