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Why so many people fail with BitLocker cloning

2025/12/16 Edited to

... Read more私がBitLocker環境でクローンに失敗しやすいと感じた理由は、「暗号化ドライブを通常の“ファイルコピー感覚”で扱ってしまう」ことでした。BitLockerは中身が暗号化されているだけでなく、起動や認証に関わる情報(システム領域/ブート周り)も絡むので、クローン方法を間違えると“起動不可”や“回復キー要求ループ”になりがちです。 よくある失敗パターンは次の通りです。 1) 解除せずに非対応方式でクローンする ソフトによってはBitLocker暗号化ボリュームの取り扱いが弱く、コピー後に整合性が取れず失敗します。暗号化状態のまま丸ごと再現したいなら、画像にもある通り「セクタ単位クローン(未使用領域も含めて複製)」対応かを確認しました。 2) コピー先SSD/HDDの容量不足 元ディスク以上の容量が必須なケースが多いです(同じ“500GB”表記でも実容量や領域構成で差が出ます)。私はここで弾かれて時間を溶かしました。 3) まったく別PCで解除/起動しようとして回復キー祭り 「bitlocker 別のpc 解除」で調べる人が多いのはこれ。TPMやセキュアブートの条件が変わると、同じディスクでもBitLockerが“別環境”と判断して回復キーを要求します。可能ならクローン後の初回起動は同じPCで行い、安定してから移設するのが無難でした。 回復キーの確認も超重要です。会社/学校アカウント管理だと、案内されるのが https://aka.ms/aadrecoverykey のパターンがあります。個人のMicrosoftアカウントに保存される場合もありますが、「microsoft アカウントにアップロードされた bitlocker 回復キーがありません」と出ることも。私がやった確認は、(a) 管理者に確認(組織端末の場合)、(b) 既存PCで事前に回復キーを控える/印刷、(c) 解除(復号)を選ぶなら完了まで電源断しない、の3つです。 「bitlockerとは わかりやすく」言うと、ドライブ全体に鍵をかける仕組みで、鍵(回復キー)を失うと開けられません。なのでクローン前に、解除(復号)してからコピーするのか、暗号化のままセクタ単位で複製するのかを先に決めるのがコツでした。 あと地味に多いのが、Windows 11でサインイン試行が止まる系(“資格情報が無効なため、次の試行が遅れています”など)。クローン直後はPIN/資格情報周りの再構成が走ることがあるので、ネット接続・時刻同期・再起動を挟んで落ち着かせると改善することがありました。 まとめると、BitLockerクローンは「(1)回復キー確保」「(2)容量条件の確認」「(3)BitLocker対応のクローン方式(セクタ単位など)」「(4)初回起動は同一PCが安全」を押さえるだけで、失敗率がかなり下がります。

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