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HomeSystem TutorialWindows SeriesHow to Make External Hard Drive Bootable in Windows 10

This article shows you how to make a bootable Windows 10 external hard drive just in case. When the computer around you fails to work or doesn't have the Windows system you want, you can just boot from the external hard drive to run your own Windows.

How to Make External Hard Drive Bootable in Windows 10


  • Way 1: Make external hard drive bootable with Rufus
  • Way 2: Make external hard drive bootable with iSumsoft SYSOnUSB
  • Way 3: Make external hard drive bootable using Command Prompt
  • How to boot from the external hard drive

Way 1: Make external hard drive bootable with Rufus

Rufus is a small program for making bootable drives. It makes it easy to make a bootable external hard drive for Windows 10.

1. Download the Windows 10 ISO file and Rufus onto your Windows 10 and connect an external hard drive to your Windows 10.

2. Launch the Rufus tool and follow these steps.

  • Select the external hard drive from the Device drop-down menu.
  • Click the SELECT button to import the Windows 10 ISO file.
  • Select Windows To Go from the Image option dropdown.
  • Leave the other options at the default values and click START.

How to Make External Hard Drive Bootable in Windows 10

3. Select the Windows 10 version you want to install on the external hard drive, and then click OK when prompted. Rufus will start writing Windows 10 to the external hard drive and make it bootable.

How to Make External Hard Drive Bootable in Windows 10

Way 2: Make external hard drive bootable with iSumsoft SYSOnUSB

iSumsoft SYSOnUSB is another simple and powerful tool for making a bootable external hard drive for Windows 10. You need a Windows 10 ISO file and follow the steps below.

Step 1: Launch iSumsoft SYSOnUSB and select the external hard drive from the Select drop-down menu in the upper right.

Step 2: Select the ISO option in the upper left, and under this option, click the file icon to import the Windows 10 ISO image file.

How to Make External Hard Drive Bootable in Windows 10

Step 3: The software will automatically extract Windows 10 operating systems from the added image file.

How to Make External Hard Drive Bootable in Windows 10

Step 4: Select the Windows 10 version you want to install onto the external hard drive and click Start. The software immediately starts making a bootable Windows 10 external hard drive.

How to Make External Hard Drive Bootable in Windows 10

Way 3: Make external hard drive bootable using Command Prompt

If you are familiar with Windows commands, you can also make a bootable Windows 10 external hard drive using Command Prompt without any third-party tools. The whole process will be a little complicated.

Step 1: Download and mount the Windows 10 ISO.

Download the Windows 10 ISO image file from the Microsoft website. After downloading, right-click the ISO file and select Mount to mount the ISO file to your computer.

How to Make External Hard Drive Bootable in Windows 10

The mounted ISO image is assigned a DVD drive letter. Write down the DVD drive letter as you will need to use it later.

How to Make External Hard Drive Bootable in Windows 10

Step 2: Create boot partition on the external hard drive.

1. Connect the external hard drive to your computer via a USB to SATA adapter cable and make sure it is recognized by your computer.

2. Open the Command Prompt as administrator and type the following diskpart commands in sequence to format the external hard drive and create a bootable partition on it. Press Enter after typing each line of command.

  • diskpart (diskpart ツールを実行)
  • ディスクのリスト (コンピュータに接続されているすべてのディスクをリストします)
  • ディスク#を選択(#は外付けハードドライブのディスク番号です)
  • clean (外付けハードドライブ上のすべてのファイルをクリーンアップします)
  • convert mbr (外付けハードドライブをMBRに変換します)
  • パーティションのプライマリ サイズ = 100 を作成します (外付けハード ドライブ上に 100MB のブート パーティションを作成します)
  • active (ブートパーティションをアクティブ化)
  • format Quick fs=fat32 label="EFIWTG" (ブートパーティションを FAT32 としてフォーマットし、そのラベルを EFIWTG として設定します)
  • assign Letter="S" (ブートパーティション S を割り当てます)
  • プライマリパーティションの作成 (外付けハードドライブにプライマリOSパーティションを作成します)
  • format Quick fs=ntfs label="WTG" (プライマリ パーティションを NTFS として迅速にフォーマットし、そのラベルを WTG として設定します)
  • assign letter="W" (プライマリ パーティションにドライブ文字 W を割り当てます)
  • ボリュームをリストする (ボリュームの詳細を確認してください)
  • exit (diskpart ツールを終了します)

How to Make External Hard Drive Bootable in Windows 10

How to Make External Hard Drive Bootable in Windows 10

ステップ 3: Windows 10 ISO を外付けハードドライブに書き込みます。

1.コマンド プロンプト ウィンドウで次のコマンドを入力し、Enter キーを押して、ISO イメージに含まれている Windows 10 オペレーティング システムを抽出します。外付けハードドライブにインストールする Windows 10 バージョンに対応するインデックス番号をメモしておきます。

dism /get-imageinfo /imagefile:E:sourcesinstall.wim (E はステップ 1 でマウントされた Windows ISO の DVD ドライブ文字です)

How to Make External Hard Drive Bootable in Windows 10

2.次のコマンドを入力して、外付けハード ドライブへの Windows 10 の書き込みを開始します。

Dism /apply-image /imagefile:E:sourcesinstall.wim /index:6 /applydir:W:

How to Make External Hard Drive Bootable in Windows 10

3.プロセスが完了するまで待ちます。 [イメージの適用] に 100% が表示されたら、Windows 10 は外付けハード ドライブに正常にインストールされています。

How to Make External Hard Drive Bootable in Windows 10

ステップ 4: 外付けハードドライブを起動可能にします。

コマンド プロンプト ウィンドウで、次の bcdboot コマンドを入力して外付けハード ドライブにブート ファイルを作成し、ドライブを起動可能にします。

W:WindowsSystem32bcdboot W:Windows /f ALL /s S:

How to Make External Hard Drive Bootable in Windows 10

これまでのところ、コマンド プロンプトを使用して Windows 10 用の起動可能な外付けハード ドライブを作成することができました。この時点で、Windows 10 システムは外付けハード ドライブから起動して実行できますが、ホスト コンピューターの内蔵ディスクの影響を受けて動作が不安定になる可能性があります。 Windows 10 OS が外付けハードドライブから安定して実行できることを確認するには、以下のステップ 5 に進んでください。

ステップ 5: 外付けハードドライブから Windows 10 を安定して実行する

1. sanpolicy.zip ファイルをコンピュータにダウンロードし、zip ファイルを解凍すると、その中に san_policy.xml ファイルと unattend.xml ファイルが表示されます。次に、以下の手順に従って、2 つの .xml ファイルを外付けハード ドライブに追加します。

2. scan_policy.xml ファイルを右クリックし、コンテキスト メニューから

送信先 > WTG (W:) を選択します。次に、「続行」をクリックして、scan_policy.xml ファイルを外付けハードドライブの OS パーティション (W:) に送信する管理者権限を付与します。

How to Make External Hard Drive Bootable in Windows 10

3.管理者としてコマンド プロンプトを開き、次の dism コマンドを実行して、外付けハード ドライブ上の Windows 10 がホストの内部ディスクに接続されないようにします。

Dism.exe /Image:W: /Apply-Unattend:W:san_policy.xml

How to Make External Hard Drive Bootable in Windows 10

4.外付けハードドライブを開き、フォルダー W:WindowsSystem32Sysprep に移動します。次に、unattend.xml をコピーして、フォルダー W:WindowsSystem32Sysprep に貼り付けます。 [続行] をクリックして、ファイルをコピーする管理者権限を付与します。

How to Make External Hard Drive Bootable in Windows 10

コマンド プロンプトを使用して Windows 10 起動可能な外付けハード ドライブを作成するために必要な作業はこれだけです。

ボーナスヒント: 外付けハードドライブから起動する方法

1. Windows 10 では、[スタート] > [電源] をクリックし、Shift キーを押しながら [電源] オプションから [再起動] を選択します。

How to Make External Hard Drive Bootable in Windows 10

2. PC が起動して「オプションの選択」画面が表示されたら、「デバイスを使用する」を選択します。

How to Make External Hard Drive Bootable in Windows 103.画面上で外付けハードドライブを選択すると、PC が外付けハードドライブから起動します。

How to Make External Hard Drive Bootable in Windows 104. PC が外付けハード ドライブからの起動を完了すると、Windows 10 が外付けハード ドライブから起動して実行されます。

How to Make External Hard Drive Bootable in Windows 10または、コンピューターの BIOS ファームウェア設定を入力して、コンピューターを外部ドライブから起動することもできます。

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