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Solved in 1 minute! How to effectively utilize "unallocated space" on a disk!

2025/8/14 Edited to

... Read moreここでは「未割り当て領域って何?」「Cドライブに結合できないのはなぜ?」「容量を減らす/空ける方法も知りたい」という方向けに、私がつまずいたポイント込みで補足します。 ■未割り当て領域とは(超かんたん) 未割り当て領域は、どのパーティション(ボリューム)にも属していない“使えない空きスペース”です。エクスプローラーには出てこないので、放置するとそのまま無駄になりがち。確認は「ディスクの管理」で、黒い帯+「未割り当て」と表示されます。 ■対処1:未割り当てを「新しいボリューム」にして使えるようにする 「Cドライブを増やす」必要がないなら、この方法が一番安全でした。 1) スタートを右クリック →「ディスクの管理」 2) 未割り当て領域を右クリック →「新しいシンプル ボリューム」 3) サイズ・ドライブ文字(例:D:)・フォーマット(通常はNTFS)をウィザードで設定 これで“普通に使えるドライブ”として増えます。 ■対処2:未割り当て領域をCドライブへ結合(できる条件/できない原因) 私が最初にハマったのがここで、Windows標準機能だと「C:の右隣に未割り当て領域が連続して存在する」場合に限り、Cドライブの「ボリュームの拡張」が押せます。 できない典型例: - C:と未割り当ての間に「回復パーティション」など別の領域が挟まっている - 未割り当てがディスクの別場所にあり“隣接”していない - 2TB超などでMBR/GPTの制限が絡むケース この場合、標準の「ディスクの管理」では結合が難しく、私はAOMEI Partition Assistant(無料版)で“間にあるパーティションの移動/結合”を検討しました。操作前にバックアップは必須です。 ■AOMEI Partition Assistantでよく見る「クローン」とは? クローンは「ディスク/パーティションを丸ごとコピーして移行する」機能で、SSD換装時に使うことが多いです。未割り当て領域の解消とは目的が違うので、容量が足りない原因が“Cドライブの枯渇”なのか、“移行したい”のかを分けて考えると迷いにくかったです。 ■そもそもCドライブ容量を減らす/空ける(ドライブ圧縮含む) 未割り当てがなくても、容量不足は起きます。私が効果を感じた順に。 - 「設定」→「システム」→「記憶域」で一時ファイル削除 - 大きいアプリ/ゲームをアンインストール or 別ドライブへ移動 - OneDrive等の同期フォルダの場所変更 - 「ドライブの圧縮」は最終手段(体感で重くなることがあるので、まずは整理優先) ■用語メモ:ボリューム/パーティションの違い ざっくり、ディスク(物理)を区切った単位がパーティション、Windowsから“ドライブ”として見える単位がボリューム、という理解でOKでした。 最後に、操作前は必ず重要データのバックアップを取ってから。特にCドライブ結合やパーティション移動は、手順を間違えると起動しないこともあるので慎重に進めてください。

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