The copying test brings somewhat better results. The senior models of the 7K250 series are faster in FAT32 than the Deskstar 180GXP, while the difference between the 8MB and 2MB buffer became apparent in NTFS. On the other hand, the old Deskstar 120GXP doesn’t yield to the junior 7K250 models and sometimes outperforms them! The Serial ATA drives are always behind their ATA analogs, which is natural considering that the new interface is realized with the help of a “serializer” chip.
The copying of files from one partition to another gave us a more or less stable picture: the bigger buffer increases the copying speed by more than 50 percent, while the 7K250 models with a 2MB buffer cannot outperform the Deskstar 120GXP! The Deskstar 180GXP has a considerably lower performance in comparison to the senior 7K250 models. We also understand the reason for the Serial ATA models to be slower: the HDS722516VLSA80 was the only drive to be tested on the new version of the driver for the Promise SATA150 TX2 controller and, as you see, it is even faster than its ATA analog.
We can also see the biggest gaps within the same series as the 250GB model copies files from one partition into another at twice the speed of the 80GB model!