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ATTA are experts in manufacturing high-end storage connectivity products, like host adapters and storage controllers. So who better to produce an accurate, reliable hard drive benchmark?
ATTO Disk Benchmark is highly configurable. You can try different transfer sizes (512KB - 8MB) and lengths (64KB - 2GB), there's support for overlapped I/O and a variety of queue depths, and a direct I/O option carries out testing with no system caching. Results appear on a graph, or you can save them for reference later.
ATTO Disk Benchmark is also surprisingly compact, at a tiny 237KB, and even better - it's portable. Unzip it to a USB drive and it's ready to use on any nearby PC.
http://download.softpedia.com/dl/42e378e97a4470a253f9a6fe07049db3/4bd34fe9/100145293/software/system/bench/bench32.zip