Download raspbian jessie @raspberry pi official website https://www.raspberrypi.org/downloads/raspbian/
Format your sd card to FAT32
Im using linux to copy the img file to the sd card
$ sudo dd bs=4M if=2017-06-21-raspbian-jessie.img of=/dev/sdx status=progress
When your sd card is not showing using
$ sudo fdisk -l
try to run this
$ lsusb
see if the usb is listed.