I am also suffering with the same issue.
Due to Virus I was formatting my phone via CMD but due to some interruption formatting was not completed so now I am getting the notification " Blank USB Storage". Even When I am connecting the phone to Laptop it's showing the removable disc J ,K and while clicking on that giving the instructions to to "Insert the Disk".
Please redirect to the solution. Any help would be much appreciated.
Btw I have Micromax A 67.
Thanks & Regards,