What is SATA2 in the hard drive?

SATA II is the chip giant Intel Intel and HDD giant Seagate Seagate developed on the basis of SATA, its main feature is that the external transmission rate from the SATA 150mb/s further increased to 300mb/s, in addition to the NCQ (Native Command Queuing, native command queue, Port multiplier, staggered start (staggered spin-up) and a series of technical features. Pure external transmission rate of 3Gbps is not true SATA II.

Key Technologies

The key technology of SATA II is the external transmission rate and NCQ technology of 3Gbps. NCQ technology can optimize the instruction execution order of the hard disk, avoid moving the head to read and write the hard disk in the same order as the traditional hard disk, and in contrast, it will sort it after receiving the command, and the head of the sort will be addressed in an efficient order. So as to avoid the loss caused by repeated movement of the head, prolong the hard life. In addition, not all SATA drives can use the NCQ technology, in addition to the hard disk itself to support NCQ, also requires the motherboard chipset SATA controller support NCQ. In addition, the NCQ technology does not support the FAT file system, and only the NTFS file system is supported.