On Sun, 13 May 2007, Radha Mohan wrote:

> How to differentiate between a pen drive and a USB HDD using any of the
> descriptors? Both the devices use same driver. I want to know whether a
> device connected is a pen-drive or a USB HDD.

There is no way to do it in general.

For a particular limited set of devices, you can tell them apart based on 
their Vendor ID, Product ID, and Serial Number strings.

Alan Stern


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