Difference between revisions of "USB flash installation media"
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{{Note|Check with {{ic|lsblk}} that the USB device is '''not''' mounted, and use {{ic|/dev/sdx}} instead of {{ic|/dev/sdx1}}. '''These are very common mistakes!'''}} | {{Note|Check with {{ic|lsblk}} that the USB device is '''not''' mounted, and use {{ic|/dev/sdx}} instead of {{ic|/dev/sdx1}}. '''These are very common mistakes!'''}} | ||
− | # dd if=archlinux.iso of=/dev/sdx | + | # dd bs=4M if=/path/to/archlinux.iso of=/dev/sdx |
==== How to restore the USB drive ==== | ==== How to restore the USB drive ==== |
Revision as of 14:38, 21 October 2012
zh-CN:USB Installation Media Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary end
This page discusses various methods on how to write an Arch Linux release to a USB drive (also referred to as "flash drive", "USB stick", "USB key", etc). The result will be a LiveCD-like system ("LiveUSB", if you will) that, because of the nature of SquashFS, will discard all changes once the computer shuts down.
If you would like to run a full install of Arch Linux from a USB drive (i.e. with persistent settings), see Installing Arch Linux on a USB key.
On GNU/Linux
Overwrite the USB drive
/dev/sdx
.lsblk
that the USB device is not mounted, and use /dev/sdx
instead of /dev/sdx1
. These are very common mistakes!# dd bs=4M if=/path/to/archlinux.iso of=/dev/sdx
How to restore the USB drive
Because the ISO image is a hybrid which can either be burned to a disc or directly written to a USB drive, it doesn't include a standard partition table.
After you install Arch Linux and you're done with the USB drive, you should zero out its first 512 bytes (meaning the boot code from the MBR and the non-standard partition table) if you want to restore it to full capacity:
# dd count=1 bs=512 if=/dev/zero of=/dev/sdx
Then create a new partition table (e.g. "msdos") and filesystem (e.g. EXT4, FAT32) using gparted, or from a terminal:
- For EXT2/3/4 (adjust accordingly), it would be:
-
# cfdisk /dev/sdx # mkfs.ext4 /dev/sdx1 # e2label /dev/sdx1 USB_STICK
- For FAT32, install the dosfstools package and run:
-
# cfdisk /dev/sdx # mkfs.vfat -F32 /dev/sdx1 # dosfslabel /dev/sdx1 USB_STICK
Without overwriting the USB drive
This method is slightly more complicated than writing the image directly with dd
, but it does keep the drive usable for data storage. Before you begin, make sure that your USB device is formatted as either FAT32, EXT2/3/4 or Btrfs. For UEFI boot and/or interoperability with other operating systems you should use FAT32. Also, make sure that you have the syslinux package (version 4.04 or newer) installed.
1. Extract the arch
folder from the ISO to the USB drive. For UEFI motherboards, extract the EFI
folder as well.
2. Install the Syslinux bootloader:
dd
and please use the drive itself in the following commands, not the first partition. This is a very common mistake.mbr.bin
file may be available as /usr/share/syslinux/mbr.bin
.$ cd /media/somefolder/arch/boot/syslinux #The USB drive's mount point. Do not skip this step. # extlinux --install . #Type it exactly as you see it, including the dot. # dd bs=440 conv=notrunc count=1 if=/usr/lib/syslinux/mbr.bin of=/dev/sdx # parted /dev/sdx toggle 1 boot
3. Adjust the configuration files:
ARCH_2012XX
" (with the appropriate release month), perhaps an even better approach is to use the UUID (this way you can re-label it whatever you want later without having to worry about it, or you could just leave it blank). Failing to do either will get you the famous 30 seconds error.Here's how you can replace the archisolabel=ARCH_2012XX
part with your equivalent of archisodevice=/dev/disk/by-uuid/47FA-4071
for both config files at the same time, using a single command:
/dev/sdx1
before running it, else it will become blank (since drive sdx
doesn't exist).$ sed -i "s|label=ARCH_2012.*|device=/dev/disk/by-uuid/$(lsblk -no UUID /dev/sdx1)|" archiso_sys{32,64}.cfg
As a workaround for FAT32 filesystems (unnecessary for EXT4), until Syslinux 4.06(*) is released, the APPEND
line from syslinux.cfg
should also be replaced:
$ sed -i "s|../../|/arch|" syslinux.cfg
On Mac OS X
To be able to use dd on your usb device on a Mac you have to do some special maneuvers. First of all insert your usb device, OS X will automount it, and run
diskutil list
in Terminal.app. Figure out what your usb device is called - mine was called /dev/disk1. (Just use the `mount` command or `sudo dmesg | tail`.) Now you run
diskutil unmountDisk /dev/disk1
to unmount the partitions on the device (i.e., /dev/disk1s1) while keeping the device proper (i.e., /dev/disk1). Now we can continue in accordance with the Linux instructions above (but use bs=8192 if you are using the OS X dd, the number comes from 1024*8).
dd if=image.iso of=/dev/disk1 bs=8192 20480+0 records in 20480+0 records out 167772160 bytes transferred in 220.016918 secs (762542 bytes/sec)
it is probably a good idea to eject your drive before physical removal at this point.
diskutil eject /dev/disk1
On Windows
Image Writer for Windows
Download the program from http://launchpad.net/win32-image-writer and run it. Select the arch image-file and usb stick. The Win32 Disk Imager's file browser assumes image files end with .img, so if the image-file you have selected ends with .iso, you will have to type its name in manually; this difference in suffixes is simply cosmetic however, the image will be written fine regardless. Click on the write button. Now you should be able to boot from the usb stick and install Arch Linux from it.
Linux Live USB Creator
Linux Live USB Creator can be used to create a bootable USB key for Arch either using a manually downloaded iso or automatically downloading the iso itself. It also supports automatic installation of VirtualBox on the USB key which can be used to boot Arch inside Windows. Visit home page for more info.
The Universal USB Installer
Universal USB Installer is a Live Linux USB Creator that allows you to choose from a selection of Linux Distributions to put on your USB Flash Drive.
UNetbootin
syslinux.cfg
and breaks the loading process. Please use a different program or method.The Flashnul Way
flashnul is an utility to verify the functionality and maintenance of Flash-Memory (USB-Flash, IDE-Flash, SecureDigital, MMC, MemoryStick, SmartMedia, XD, CompactFlash etc).
From a command prompt, invoke flashnul with -p, and determine which device index is your USB drive. For example, my output looks like this:
C:\>flashnul -p Avaible physical drives: Avaible logical disks: C:\ D:\ E:\
In my case, it is drive E:
When you have determined which device is the correct one, you can write the image to your drive, by invoking flashnul with the device index, -L, and the path to your image. In my case, it would be
C:\>flashnul E: -L path\to\arch.iso
As long as you are really sure you want to write the data, type yes, then wait a bit for it to write. If you get an access denied error, close any Explorer windows you have open.
If under Vista or Win7, you should open the console as administrator, or else flashnul will fail to open the stick as a block device and will only be able to write via the drive handle windows provides
The Cygwin Way
Make sure your Cygwin installation contains the dd package. Or if you do not want to install Cygwin, you can simply download dd for windows from http://www.chrysocome.net/dd.
Place your image file in your home directory, in my case it is:
C:\cygwin\home\John\
Run cygwin as administrator (required for cygwin to access hardware). To write to your USB drive use the following command:
dd if=image.iso of=\\.\[x]:
where image.iso is the path to the iso-image file within the cygwin directory and \\.\[x]: is your USB device where x is the windows designated letter, in my case "\\.\d:".
On cygwin 6.0 find out the correct partition with
cat /proc/partitions
and write the ISO image with the information from the output. Example:
dd if=image.iso of=/dev/sdb
dd for Windows
A GPL licensed dd version for Windows is available at http://www.chrysocome.net/dd. The advantage of this over Cygwin is smaller download. Use it as shown in instructions for Cygwin above.
Boot the entire ISO from RAM
This method uses Syslinux and MEMDISK to load the entire ISO image in RAM, so make sure you have enough RAM to hold it. Once it's done loading and you see the graphical menu you can simply remove the USB stick and maybe even use it on a different machine to start the process all over again. It also allows booting and installing Arch from (and to) the same USB stick.
1. Format the USB stick as FAT32 and create the following folders:
X:\Boot X:\Boot\ISOs X:\Boot\Settings
2. Copy the ISO you'd like to boot to the "ISOs" folder (e.g. archlinux-2012.08.04-dual.iso), and extract from the latest release (e.g. syslinux-4.05.zip):
-
./win32/syslinux.exe
to the desktop, or wherever you want.
-
./memdisk/memdisk
to the "Settings" folder.
And while you're in this folder, create a syslinux.cfg
file:
X:\Boot\Settings\syslinux.cfg
DEFAULT arch_iso LABEL arch_iso MENU LABEL Arch Setup LINUX memdisk INITRD /Boot/ISOs/archlinux-2012.08.04-dual.iso APPEND iso
3. Finally, create a *.bat
file where syslinux.exe
is located and run it ("Run as administrator" if you're on Vista or Windows 7):
C:\Documents and Settings\username\Desktop\install.bat
@echo off syslinux.exe -m -a -d /Boot/Settings X:
Done.
Boot Arch Linux (i686)
entry and add vmalloc=448M
at the end. This only applies to the MEMDISK method. For reference: If your image is bigger than 128MiB and you have a 32-bit OS, then you have to increase the maximum memory usage of vmalloc. (*)