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How to Unlock BitLocker on External HDD! Beginner's Guide

2025/8/18 Edited to

... Read more私が外付けHDDで困ったのは、急に「回復キーを入力してください」と出て開けなくなったときでした。ここでは、解除(無効化)の手順に加えて、検索でよく見かける“詰まりポイント”の対処をまとめます。 ■まず確認:いま必要なのは「解除」?「回復キー」? 外付けHDDに鍵マークが付いていても、状況は2つあります。 ・通常のパスワード(ロック解除)を求められている:パスワードが分かればアクセス可能 ・回復キー(48桁)を求められている:セキュリティ上の理由で追加確認が必要 この「回復キー要求」が出ていると、BitLockerを無効化する前にまず開ける状態に戻す必要があります。 ■回復キーが求められる主な原因(体感で多い順) ・別のPCに挿した/USBポートを変えた ・Windows更新後に突然出た ・TPMやセキュリティ設定が変わった(企業PC・中古PCで多い) ・外付けHDDの接続が不安定(ケーブル不良や電力不足) 私はケーブルが原因で認識が揺れて、回復キー要求が出たことがありました。 ■回復キーが見つからない時の探し方(https://aka.ms/myrecoverykey) Microsoftアカウントで暗号化していた場合、ブラウザで「https://aka.ms/myrecoverykey」を開くと、登録済みの回復キー一覧が出ることがあります。 ポイントは、暗号化した“当時のアカウント”でサインインすること。仕事用・個人用でアカウントを分けていると、別アカウント側に保存されていることがありました。 ■「回復キー入力できない」時に試したいこと ・数字はハイフンなしで入力(48桁) ・全角になっていないか確認 ・別の入力欄に貼り付けできない場合はメモ帳経由で貼り付け ・キーボード配列(日本語/英語)を切り替える これだけで通ったことが一度あります。 ■Windows11/10で鍵マークを外す=BitLockerを無効化する流れ 外付けHDDが開ける状態になったら、次は「BitLockerを無効にする(復号)」です。 ・エクスプローラーで外付けHDDを右クリック ・「BitLockerの管理」→「BitLockerを無効にする」 復号は容量により時間がかかります。途中で抜くとトラブルになりやすいので、AC電源・安定したUSB接続で放置が安心でした。 ■Windowsセキュリティにブロックされる/操作できない時 管理画面が開けない・ボタンが押せない場合は、管理者権限の確認や、社用PCのポリシー制限の可能性があります。可能なら別の管理者アカウントで操作する、または会社のIT担当に確認が早いです。 ■最後に:解除前にやってよかったこと 解除(復号)の前に、必要なデータを別の場所にコピーしておくと安心です。外付けHDDの状態が悪いと復号中にエラーが出ることもあるので、「先にバックアップ→その後に無効化」が個人的に安全策でした。

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