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I recently acquired a new Western Digital Caviar Black 640 GB with 64 MB cache and SATA III compatibility ( WD6402AAEX ).
The below results compare the performance of the hard drive when hooked up to the motherboard's SATA II port versus the SATA III port.
The hard drive is NTFS-formatted and empty of any content.
Notable differences:
Benchmark (Read)

Random Access (Read)

Extra Tests (Read)

File Benchmark (32 KB)

File Benchmark (128 KB)

File Benchmark (1 MB)

File Benchmark (16 MB)

File Benchmark (64 MB)

File Benchmark (512 MB)

Additional Tags: plugged into attached to using compared to
The below results compare the performance of the hard drive when hooked up to the motherboard's SATA II port versus the SATA III port.
The hard drive is NTFS-formatted and empty of any content.
Notable differences:
- The burst speed is greater in SATA III configuration.
- The read speeds for file benchmarks are generally greater in SATA III configuration.
Benchmark (Read)

Random Access (Read)

Extra Tests (Read)

File Benchmark (32 KB)

File Benchmark (128 KB)

File Benchmark (1 MB)

File Benchmark (16 MB)

File Benchmark (64 MB)

File Benchmark (512 MB)

Additional Tags: plugged into attached to using compared to