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How to Adjust Free Space in Disk Management

C drive capacity shortage or "volume expansion" is not possible...

In such cases, you can solve it in a way that suits the cause.

We will show you how to check with standard Windows functions and how to adjust with one click with Partition Assistant.

# windows # Disk Management # partition # C drive Lack of capacity# Partition Assistant # PC Convenience

7/10 Edited to

... Read more「パソコンのストレージがいっぱい」と出ると、まずCドライブの空き確保を考えますよね。私も最初は“Dに空きがあるのにCを増やせない”状態で詰まりました。結論から言うと、Windowsの「ディスクの管理」だけで解決できるケースと、回復パーティション等が邪魔していて拡張できないケースがあります。 ■ディスクマネジメント(ディスクの管理)とは? Windows標準のパーティション管理ツールで、ボリュームの作成/削除/縮小/拡張、ドライブ文字の変更などができます。ただし「拡張」は“Cドライブの右隣に未割り当て領域がある場合のみ”有効になるのが基本です。ここを知らないと、ボリュームの拡張がグレーアウトして永遠に悩みます。 ■「ボリュームの拡張」がグレーアウトする主な原因 ・Cドライブの右側に未割り当て領域がない(Dが隣にあるだけ) ・Cと未割り当て領域の間に「回復パーティション(Recovery)」が挟まっている ・ディスクの形式や構成上、拡張できない配置になっている 特に“回復パーティションが間にいる”パターンは多いです。これがあると、Dを縮小して未割り当てを作ってもCの隣にならず、拡張できません。 ■回復パーティションを移動できるフリーソフトは?(注意点つき) 回復パーティションを「移動」してCの隣に未割り当て領域を作れるツールがありますが、ここは慎重に。回復領域はWindowsの修復に関わるため、操作前に必ずバックアップ(できればシステムイメージ)を取りました。私の場合は、GUIで“ドラッグで位置を移動→適用”できるタイプが分かりやすかったです。 ■Cドライブ整理ソフトを使う前に、まずやったこと ・設定>システム>記憶域(ストレージ)で一時ファイルを削除 ・ごみ箱/ダウンロード/大容量フォルダを確認 ・アプリやゲームをDへ移動(可能なもの) この段階で数GB〜十数GB空くこともあります。増設やパーティション変更の前に、まず“中身を軽くする”のが安全でした。 ■外付けSSD 2TBおすすめの使い方(ストレージ逼迫の逃げ道) 容量が慢性的に足りないなら、外付けSSDに写真・動画・バックアップを逃がすのが体感一番ラクでした。大事なのは「作業用はPC内、保管用は外付け」と役割を分けること。フォルダ単位で移すと管理が崩れにくいです。 最後に、パーティション調整は便利ですが失敗すると起動不能のリスクもあります。私は作業前に“バックアップ→ディスクの管理で配置確認→できない理由を特定→ツールでワンクリック調整”の順に進めたらスムーズでした。

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