Performance in WinBench 99
First, you can have a look at the surface read speed graphs of the three testing participants:
The difference between the interfaces can be clearly seen here. The data-transfer graph of the HD-227FW has a very short horizontal stretch which goes at 37MB/s whereas all the USB models have a horizontal stretch at 30MB/s and its length is over 70GB, i.e. over half of the disk storage capacity. This horizontal stretch is the result of the data-transfer rate being limited by the interface the disk is connected to the PC with.
Now let’s check out 32GB partitions formatted in FAT32.
The USB models perform similarly, and the Transcend wins only through having a slightly better result in the High-End Disk Winmark subtest. The HD-227FW proves to be the slowest one here, especially in Business Disk Winmark. So, the interface alone cannot win everything, although I can hardly imagine a programmer who would use an external disk as the main one, and it is the programming test (the last in the table) that the FireWire-interfaced drive failed completely.
The HD-227FW looks hopeless in NTFS while its USB counterpart takes first place.
But the FireWire model has no rivals with its data-transfer rate, especially at the end of the disk. The Transcend cannot overcome the 30,000KB/s mark as the others do.
The WD Passport and the HD-227FW have the best access time among the tested devices, while the Transcend StoreJet has the worst result. The difference is a mere 0.4 milliseconds, though.