Create Arch Linux Live USB

Table of Contents

Download image and PGP signature

From https://www.archlinux.org/download/. The preferred option is to download the image using bittorrent, so as to unburden the Arch servers.

Verify downloaded image

$ gpg --keyserver pgp.mit.edu                       \
        --keyserver-options auto-key-retrieve       \
        --verify archlinux-version-x86_64.iso.sig

If this disk is being created on an Arch Linux system, you could also invoke:

$ pacman-key -v archlinux-version-x86_64.iso.sig

The -v switch is short for --verify.

Insert USB drive and check the device name

$ sudo fdisk -l

The -l is short for --list, and will display the device names and partition tables.

Output will look like:

Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: CT2000MX500SSD1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x117d68c1

Device     Boot Start        End    Sectors  Size Id Type
/dev/sdb1        2048 3907029167 3907027120  1.8T 83 Linux

Check the output and find the device name of the USB (for instance /dev/sdc). Make sure this device is not mounted, otherwise the next command will fail. Also make sure you note the device name, and not a partition (indicated by a numeral at the end: /dev/sdc1, for example).

Copy Arch Linux image to USB drive

$ sudo dd if=archlinux-2019-01-01-x86_64.iso    \
        of=/dev/sdX                             \
        bs=64K                                  \
        oflag=sync                              \
        status=progess

Breakdown:

  • if indicates the input file (the .iso of the live Linux distro).
  • of, likewise, points to the output file, which is a device in this case. Note that /dev/sdX needs to be replaced with the device name we found in the previous step.
  • bs=64K indicates the block size, which means that dd will read and write up to 64K bytes at a time. The default is 512 bytes. It really depends what the optimal block size is, but several sources indicate that 64K is a good bet on somewhat modern to modern hardware.
  • oflag stands for “output flag”. The sync flag will make sure that all data is written to the USB stick when the dd command exits, so it will be safe to remove the USB stick.
  • status=progress indicates the level of information that is printed during file transfer. progress shows periodic transfer statistics.

Notice that the device does not need to be partitioned or empty before this operation. When dd writes to a device rather than a partition, all data on the drive – including partitions – will be erased anyway.

Leave a Reply

Your email address will not be published. Required fields are marked *