1.5 gb/s
It depends on the PATA drive in question. That said, the fastest UDMA interface when used with an 80-wire cable is 133 MB/s. From there, the maximum transfer rate for a SATA generation 1 drive is 150 MB/s. For SATA 2, it is 300 MB/s. For SATA 3, it is 600 MB/s.
disk rotational speed in RPM
SATA III doubles the maximum data transfer rate for previous Serial ATA storage interface specifications from 3 to 6 Gigabits per second (6 Gb/s),
disk rotational speed in RPM
The main difference is transfer speed, if you for instance a new solid state drive it a sat 1 port it will be limited in speed, still fast but not the maximum performance you could get out of it, For a conventional Hard drive you won't notice the difference though. All sata devices are backward compatible so theres no worries there
3.0 GBPS
no, sata drives transfer all of the data through the sata cable
1.5Gb/sec
3Gb/sec
Theoretical maximum throughput: SATA II: 3Gb per second. SATA III: 6Gb per second. The maximum uncoded transfer rates are 2.4 Gb per second and 4.8Gb per second, respectively.
E sata transfers at a rate of 300 megabytes per second and tapes transfer at a rate of up to 80 megabytes per second. E sata is by far the faster solution
Cable size, data transfer speed, and SATA is newer technology.