In our testing, Serial ATA-II running at full speed doesn't offer any great speed advantage over the SATA-150 drives, so until the magnetic storage components are replaced with high speed non-violate memory, we won't see much in terms of speed upgrades with SATA-II at its current form.

Overall the speed of the Western Digital drive isn't impressive as a single drive not in RAID, but the additional features make SATA all the more enticing as the new storage interconnect standard and in a RAID 0 array we've seen SATA-II drives really shine. Western Digital's implementation of SATA-II is good and drive is built to typical high-quality WD standards however unfortunately our performance benchmarks were not as impressive as we imagined they would be.