Etcher User Documentation

This document contains how-tos and FAQs oriented to Etcher users.

Config

Etcher's configuration is saved to the config.json file in the apps folder. Not all the options are surfaced to the UI. You may edit this file to tweak settings even before launching the app.

Why is my drive not bootable?

Etcher copies images to drives byte by byte, without doing any transformation to the final device, which means images that require special treatment to be made bootable, like Windows images, will not work out of the box. In these cases, the general advice is to use software specific to those kind of images, usually available from the image publishers themselves.

Images known to require special treatment:

Microsoft Windows (use Windows USB/DVD Download Tool, Rufus, or WoeUSB).
Windows 10 IoT (use the Windows 10 IoT Core Dashboard)

How can I configure persistent storage?

Some programs, usually oriented at making GNU/Linux live USB drives, include an option to set persistent storage. This is currently not supported by Etcher, so if you require this functionality, we advise to fallback to UNetbootin.

Deactivate desktop shortcut prompt on GNU/Linux

This is a feature provided by AppImages, where the applications prompts the user to automatically register a desktop shortcut to easily access the application.

To deactivate this feature, touch any of the files listed below:

$HOME/.local/share/appimagekit/no_desktopintegration
/usr/share/appimagekit/no_desktopintegration
/etc/appimagekit/no_desktopintegration

Alternatively, set the SKIP environment variable before executing the AppImage:

SKIP=1 ./Etcher-linux-<arch>.AppImage

Flashing Ubuntu ISOs

Ubuntu images (and potentially some other related GNU/Linux distributions) have a peculiar format that allows the image to boot without any further modification from both CDs and USB drives.

A consequence of this enhancement is that some programs, like parted get confused about the drive's format and partition table, printing warnings such as:

/dev/xxx contains GPT signatures, indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should. Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Is this a GPT partition table? Both the primary and backup GPT tables are corrupt. Try making a fresh table, and using Parted's rescue feature to recover partitions.

Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes.

All these warnings are safe to ignore, and your drive should be able to boot without any problems.

Refer to the following message from Ubuntu's mailing list if you want to learn more.

Running on Wayland

Electron is based on Gtk2, which can't run natively on Wayland. Fortunately, the XWayland Server provides backwards compatibility to run any X client on Wayland, including Etcher.

This usually works out of the box on mainstream GNU/Linux distributions that properly support Wayland. If it doesn't, make sure the xwayland.so module is being loaded by declaring it in your weston.ini:

[core]
modules=xwayland.so

Runtime GNU/Linux dependencies

This entry aims to provide an up to date list of runtime dependencies needed to run Etcher on a GNU/Linux system.

Electron specific

See brightray's gyp file

gtk+-2.0
dbus-1
x11
xi
xcursor
xdamage
xrandr
xcomposite
xext
xfixes
xrender
xtst
xscrnsaver
gmodule-2.0
nss

Optional dependencies:

libnotify (for notifications)
libspeechd (for text-to-speech)

Etcher specific:

liblzma (for xz decompression)

Recovering broken drives

Sometimes, things might go wrong, and you end up with a half-flashed drive that is unusable by your operating systems, and common graphical tools might even refuse to get it back to a normal state.

To solve these kinds of problems, we've collected a list of fail-proof methods to completely erase your drive in major operating systems.

Windows

In Windows, we'll use diskpart, a command line utility tool that comes pre-installed in all modern Windows versions.

Open cmd.exe from either the list of all installed applications, or from the "Run..." dialog usually accessible by pressing Ctrl+X.
Type diskpart.exe and press "Enter". You'll be asked to provide administrator permissions, and a new prompt window will appear. The following commands should be run in the new window.
Run list disk to list the available drives. Take note of the number id that identifies the drive you want to clean.
Run select disk N, where N corresponds to the id from the previous step.
Run clean. This command will completely clean your drive by erasing any existent filesystem.
Run create partition primary. This command will create a new partition.
Run active. This command will active the partition.
Run list partition. This command will show available partition.
Run select partition N, where N corresponds to the id of the newly available partition.
Run format override quick. This command will format the partition. You can choose a specific formatting by adding FS=xx where xx could be NTFS or FAT or FAT32 after format. Example : format FS=NTFS override quick
Run exit to quit diskpart.

OS X

Run the following command in Terminal.app, replacing N by the corresponding disk number, which you can find by running diskutil list:

diskutil eraseDisk FAT32 UNTITLED MBRFormat /dev/diskN

GNU/Linux

Make sure the drive is unmounted (umount /dev/xxx), and run the following command as root, replacing xxx by your actual device path:

dd if=/dev/zero of=/dev/xxx bs=512 count=1 conv=notrunc

"No polkit authentication agent found" error in GNU/Linux

Etcher requires an available polkit authentication agent in your system in order to show a secure password prompt dialog to perform elevation. Make sure you have one installed for the desktop environment of your choice.

Running in older macOS versions

Etcher GUI is based on the Electron framework, which only supports macOS 10.10 (Yosemite) and newer versions.

See PUBLISHING for more details about release types.