Steps
- Connect your USB storage device into your laptop and open Terminal (you can find this on Spotlight search)
Try following commands
$ sudo diskutil list
The above command will help you to find the Storage device name like /dev/disk2 (/dev/disk2 is my pen-drive with 8 GB storage space)
$ sudo diskutil erasedisk FAT32 USB /dev/disk2
The above command will help you to format/erase storage device, please make sure nothing is important in that storage device.
$ sudo diskutil unmoutdisk /dev/disk2
The above command will help you to unmount storage device from your machine.
$ sudo dd if=./name.iso of=/dev/disk2 bs=1m
The above command will help you to make your storage device bootable. This process will take time, so please wait until the process complete. In my case it took around 20 mins, it is depends on you machine resource specification.
After finishing the process remove the device from machine and use it for install or try the boot a machine.