Presently I have the external hard disk of seagate freeagent go of 250 GB. While connecting to my desktop, it is not sensing. While the same disk I tried with my friends laptop, it is working. So I have the doubt that the upgradation of the driver. Hence this request.
Was it working before, then you upgraded the driver, and now it doesn't work ? - If so, use device manager, and roll back driver to previous version. That is, provided you did not uninstall the driver.