Debian installation images for this architecture are created using the isohybrid technology; that means they can be written directly to a USB stick, which is a very easy way to make an installation media. Simply choose an image (such as the netinst, CD or DVD-1) that will fit on your USB stick. See 4.1 – „Official Debian GNU/Linux installation images“ to get an installation image.

Jestliže máte opravdu malou klíčenku v řádu megabajtů, můžete z adresáře netboot stáhnout obraz mini.iso (viz kapitola 4.2.1 – „Where to Find Installation Files“), nicméně tato varianta zavede pouze minimální instalační systém a zbytek stahuje ze sítě.

The installation image you choose should be written directly to the USB stick, overwriting its current contents. For example, when using an existing GNU/Linux system, the image file can be written to a USB stick as follows, after having made sure that the stick is unmounted:

# cp debian.iso /dev/sdX
# sync

Information about how to do this on other operating systems can be found in the Debian CD FAQ.

	Důležité
	Obraz je nutno zapsat na celé zařízení, ne jen do případné oblasti, tj. například do /dev/sdb a ne /dev/sdb1. Také nepoužívejte nástroje jako unetbootin, které zapisovaný obraz mění.

	Důležité
	Simply writing the installation image to USB like this should work fine for most users. The other options below are more complex, mainly for people with specialised needs.

Hybridní obraz na USB klíčence obvykle nezabírá veškerý prostor, což přímo vybízí použití volného místa pro uložení potřebných souborů s firmwarem, speciálních balíků, nebo jiných souborů. Veškeré soubory jsou pak pěkně pohromadě na jednom médiu.

To do so, use cfdisk or any other partitioning tool to create an additional partition on the stick. Then create a (FAT) filesystem on the partition, mount it and copy or unpack the firmware onto it, for example with:

# mkdosfs -n FIRMWARE /dev/sdX3
# mount /dev/sdX3 /mnt
# cd /mnt
# tar zxvf /path/to/firmware.tar.gz
# cd /
# umount /mnt

Take care that you use the correct device name for your USB stick. The mkdosfs command is contained in the dosfstools Debian package.

	Poznámka
	If you have chosen the mini.iso to be written to the USB stick, the second partition doesn't have to be created, as - very nicely - it will already be present. Unplugging and replugging the USB stick should make the two partitions visible.

Prior to isohybrid technology being used for Debian installation images, the methods documented in the chapters below were used to prepare media for booting from USB devices. These have been superseded by the technique in 4.3.1 – „Preparing a USB stick using a hybrid CD/DVD image“, but have been left here for educational and historical purposes and in case they are useful to some user.

An alternative to the method described in 4.3.1 – „Preparing a USB stick using a hybrid CD/DVD image“ is to manually copy the installer files, and also an installation image to the stick. Note that the USB stick should be at least 1 GB in size (smaller setups are possible using the files from netboot, following 4.3.3 – „Ruční kopírování souborů — pružná cesta“).

There is an all-in-one file hd-media/boot.img.gz which contains all the installer files (including the kernel) as well as syslinux and its configuration file.

	Poznámka
	I když je tento způsob vytvoření zaváděcího USB média pohodlný, má jednu zásadní nevýhodu: logická velikost zařízení bude vždy omezena na 1 GB, i když je skutečná kapacita USB klíčenky mnohonásobně větší. Budete-li ji chtít někdy v budoucnu použít k jinému účelu a budete-li vyžadovat její celou kapacitu, budete ji muset přerozdělit a znovu vytvořit souborový systém.

Simply extract this image directly to your USB stick:

# zcat boot.img.gz > /dev/sdX

After that, mount the USB memory stick (mount /dev/sdX /mnt), which will now have a FAT filesystem on it, and copy a Debian ISO image (netinst or full CD; see 4.1 – „Official Debian GNU/Linux installation images“) to it. Unmount the stick (umount /mnt) and you are done.

Pokud máte rádi více pružnosti, nebo jen chcete zjistit „co se děje za oponou“, můžete použít následující metodu, ve které mj. ukážeme, jak místo celého USB zařízení použít pouze první oblast.

4.3.3.1. Partitioning and adding a boot loader

We will show how to set up the memory stick to use the first partition, instead of the entire device.

In order to start the kernel after booting from the USB stick, we will put a boot loader on the stick. Although any boot loader should work, it's convenient to use syslinux, since it uses a FAT16 partition and can be reconfigured by just editing a text file. Any operating system which supports the FAT file system can be used to make changes to the configuration of the boot loader.

First, you need to install the syslinux and mtools packages on your system.

Poznámka

Since most USB sticks come pre-configured with a single FAT16 partition, you probably won't have to repartition or reformat the stick. If you have to do that anyway, use cfdisk or any other partitioning tool to create a FAT16 partition now[3], and then install an MBR using: # cat /usr/lib/syslinux/mbr/mbr.bin >/dev/sdX Now create the filesystem using: # mkdosfs /dev/sdX1 Take care that you use the correct device name for your USB stick. The mkdosfs command is contained in the dosfstools Debian package.

Having a correctly partitioned USB stick (now), you need to put syslinux on the FAT16 partition with:

# syslinux /dev/sdX1

Again, take care that you use the correct device name. The partition must not be mounted when starting syslinux. This procedure writes a boot sector to the partition and creates the file ldlinux.sys which contains the boot loader code.

default vmlinuz initrd=initrd.gz