dd if=/dev/zero of=your_device bs=1M count=10240

be careful you're just measuring sequentiel write speed and not random write speed.

Regards

Noam Rathaus wrote:
Hi,

How can I verify the speed of the USB2 device?

It is an external HD, and access to it appear slow

hdparam reports 750Mb/s but actual write and read time appear slower.


--
Cyril SCETBON


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