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Easy Way to Transfer D Drive Space to C Drive!

2025/10/11 Edited to

... Read more私のPCでも「Cドライブの空き容量が足りない」状態になると、Windowsアップデートやアプリ更新が失敗しやすくなって一気に不安定になりました。そこでやったのが、Dドライブの空きをCドライブに回す(割り当てる)方法です。Windows11/Windows10どちらでも考え方は同じなので、まずは“自分の状況がどっちの手順になるか”を確認するのが近道でした。 【最初に確認】Cの右隣に「未割り当て領域」はありますか? エクスプローラーではなく、Windowsの「ディスクの管理」で確認します。 1) 「PC(This PC)」を右クリック →「管理」 2)「ディスクの管理」 ここで表示される横長のバーで、Cドライブの“右側”に「未割り当て」がピッタリ隣にあるかどうかが重要です。 【方法1:ディスクの管理で拡張(条件あり・一番安全)】 Cドライブの右隣に未割り当て領域がある場合は、Cを右クリック→「ボリュームの拡張」で容量追加できます。ここがポイントで、未割り当て領域が隣にないと拡張できません(私も最初ここで詰まりました)。 【方法2:Dの空きをCに割り当て(隣に未割り当てがない場合)】 DドライブがCの右側にある構成だと、Dを縮小して未割り当てを作っても、未割り当てがDの“右側”にできてしまいCに使えないことがあります。その場合は、パーティションを移動できるパーティション管理ツール(例:Partition Assistant等)の「空き領域を割り当てる」機能が便利でした。 私がやった流れは、Dを右クリック→「空き領域を割り当てる」→割り当て先をCに指定→実行、という感じで数クリックでした。 【やる前の注意点(失敗しないために)】 ・必ずバックアップ:大事なデータはUSBメモリや外付けHDD、クラウドへ。USBメモリからパソコンに移す/逆に保存する方法が不安なら、先にそこを固めるのがおすすめです。 ・BitLocker暗号化中は要注意:一時停止が必要な場合があります。 ・空き容量の目安:Cは最低でも10〜20GB以上、できれば30GB以上空けると体感が安定しました。 【ついでにできるCドライブの整理】 割り当て前後に「ディスク クリーンアップ」やWindows11の「設定→システム→記憶域」で一時ファイル削除、不要アプリ削除をすると効果が出やすいです。CからDへ移動できるデータ(動画・写真・ダウンロード)をDに寄せるだけでも、容量不足の再発がかなり減りました。 「Dドライブどこ?」という人は、エクスプローラーの「PC」に表示される“ローカル ディスク(C:)(D:)”が対象です。ローカルディスクとは、PC内部の保存領域を区切ったもの(パーティション)なので、正しく割り当てるとCの容量不足がスッキリ解決できます。

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