4.3. USB メモリでの起動用ファイルの準備

4.3. USB メモリでの起動用ファイルの準備
	第4章システムインストールメディアの入手

To prepare the USB stick, we recommend to use a system where GNU/Linux is already running and where USB is supported. With current GNU/Linux systems the USB stick should be automatically recognized when you insert it. If it is not you should check that the usb-storage kernel module is loaded. When the USB stick is inserted, it will be mapped to a device named /dev/sdX, where the 「X」 is a letter in the range a-z. You should be able to see to which device the USB stick was mapped by running the command lsblk before and after inserting it. (The output of dmesg (as root) is another possible method for that.) To write to your stick, you may have to turn off its write protection switch.

	警告
	The procedures described in this section will destroy anything already on the device! Make very sure that you use the correct device name for your USB stick. If you use the wrong device the result could be that all information on, for example, a hard disk is lost.

4.3.1. ハイブリッド CD/DVD イメージを使った USB メモリの準備

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 「公式 Debian GNU/Linux インストールイメージ」 to get an installation image.

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

Simply writing the installation image to USB like this should work fine for most users. For special needs there is this wiki page.

他のオペレーティングシステムでのやり方については、Debian CD FAQ で確認できます。

	重要
	イメージはパーティションではなくディスクデバイス全体を指定する必要があります。例えば /dev/sdb1 ではなく /dev/sdb となります。イメージの書き換える unetbootin のようなツールは使わないでください。


4.2. Debian ミラーサイトからのファイルのダウンロード		4.4. ハードディスク起動ファイルの準備