is there a dvd drice with sata 3 or is dvd not able to take advantage of sata 3?
It is not even able to take advantage of sata II throughput.
I think SATA 3 drives cost a bit more...
Not that I'm aware of. There might be some pro duplicators that use it, but not 100% on that.
The transfer rate of a CD/DVD/BR drive doesn't even hit close to ATA133, let alone SATA 1. Due to costs, many drives are loaded with SATA 2 controllers, but only because those chips are cheaper than SATA 1, and buying a SATA 3 compliant drive currently is a waste of money because no advantage is gained and SATA 3 controller chips are still relatively expensive.
As Rodney noted, the only ones I have seen are large volume duplicators with large memory banks that use the speed of SATA 3 simply for loading the image and not for operation.
Remember that all SATA hosts are backwards compatible, e.g. SATA 2 and SATA 1 will work fine on a SATA 3 port.
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