This is a really slow drive or controller.

Consumer grade 3.5 inch 2TB drives typically can handle 100MB/s.  I would
suspect in the absence of real information that your controller is more
likely to be deficient than your drive.  If this is on a laptop or
something, then I withdraw my thought.

On Tue, Jan 25, 2011 at 4:50 PM, Da Zheng <zhengda1...@gmail.com> wrote:

> The aggregate write-rate can get much higher if you use more drives, but a
>> single stream throughput is limited to the speed of one disk spindle.
>>
>>  You are right. I measure the performance of the hard drive. It seems the
> bottleneck is the hard drive, but the hard drive is a little too slow. The
> average writing rate is 50MB/s.

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