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Communicates at a rate of 1.5Gbit/s. It can only handle a single pending transaction at a time while SCSI disks can handle multiple outstanding requests, allowing the drive targets to re-order the requests to optimize response-time.SATA or SATA 1 or SATA I - Communicates at a rate of 1.5Gbit/s. It can only handle a single pending transaction at a time while SCSI disks can handle multiple outstanding requests, allowing the drive targets to re-order the requests to optimize response-time.Communicates at a rate of 3Gbit/s. The term SATA II has grown in popularity as the moniker for the SATA 3Gb/s data transfer rate even though it is a misnomer. SATA II was the name of the organization formed to author the SATA specifications, now known as the Serial ATA International Organization, or SATA-IO. 3Gb/s has become synonymous with the term SATA II. SATA 2 or SATA II - Communicates at a rate of 3Gbit/s. The term SATA II has grown in popularity as the moniker for the SATA 3Gb/s data transfer rate even though it is a misnomer. SATA II was the name of the organization formed to author the SATA specifications, now known as the Serial ATA International Organization, or SATA-IO. 3Gb/s has become synonymous with the term SATA II. Communicates at a rate of 6Gbit/s.SATA 3 or SATA III - Communicates at a rate of 6Gbit/s.