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spixx/bootable-usb-1.md

Created March 30, 2020 16:45
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bootable-usb-1.md

Bootable USB

Preamble

Short guide in how you can create a bootable USB from a ISO image.

Warning, the commands below are all potentially able to overwrite important data. Make sure you are using the correct devices when performing the dd command.

What device

First step is to figure out which device we can overwrite. One good command is:

lsblk

This will output all block devices currently attached to the system:

NAME                                          MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT                                                           
sda                                             8:0    1 14.4G  0 disk                                                                       
└─sda1                                          8:1    1 14.4G  0 part                                                                       
nvme0n1                                       259:0    0  477G  0 disk                                                                       
├─nvme0n1p1                                   259:1    0  512M  0 part  /boot/efi                                                            
├─nvme0n1p2                                   259:2    0  512M  0 part  /boot                                                                
└─nvme0n1p3                                   259:3    0  476G  0 part

In this example you can see my primary NVME based SSD and a USB drive. Commonly /dev/sda is the first drive and most likely where the OS is installed. Please ensure that you are using the correct device!

Download

I usually feel lazy and just utilize wget or curl but it might be simpler to download via a browser.

Create ISO

dd if="~/Downloads/centos.iso" of="/dev/sda" status="progress" ; sync

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