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This is the reason why 4TB HDD does not recognize! Solved the problem of only 2TB on Windows 10

2025/12/10 Edited to

... Read more私も「4TB HDDをつないだのに2TBしか出ない」「そもそもHDDが認識しない」状態に当たったことがあります。結論から言うと、4TBをフルで使うには“ディスクがGPT形式”であることがほぼ必須です(MBRだと約2TBの壁)。さらに“起動ディスクとして使う場合”はPCがUEFIブートに対応している必要があります。 まず確認したいのは、Windows10の「ディスクの管理」です。スタートを右クリック→[ディスクの管理]で開き、対象HDDが「未割り当て」や「2TB+残りが未割り当て」になっていないか見ます。ここで2TBしか領域を作れない場合、MBRで初期化されている可能性が高いです。ディスク名を右クリックして[プロパティ]→[ボリューム]で「パーティションのスタイル(MBR/GPT)」を確認できます。 次に「認識しない」ケースの切り分け。外付けHDDなら、別USBポート(できれば背面)や別ケーブルに変更、USBハブ経由をやめる、電源付きケースならACアダプタを確認します。エクスプローラーに出ないだけなら、ドライブ文字が未割り当てのこともあるので、ディスクの管理で右クリック→[ドライブ文字とパスの変更]で割り当てると表示されることがあります。 GPTへ変換する方法は2通りあります。1つ目はWindows標準の方法で、diskpartの「convert gpt」やディスクの管理で変換しますが、基本的に“データ消去が必要”です。2つ目は、データを消さずにMBR→GPT変換できるツールを使うやり方で、私が試したのはAOMEI Partition Assistantのようなパーティション管理ソフトです。操作は分かりやすい反面、念のため重要データはバックアップしてから実行しました。 また、ファイルシステムにも注意です。Windows中心ならNTFSが無難で、FAT32は単体4GB制限があるので大容量HDDの運用に不向きです。もし「RAW」と表示される場合は、フォーマット前に復旧方針を決めた方が安全です(復旧フリーソフトを試すなら書き込みを極力しないのがコツ)。 最後に、運用面の小技として「USBを安全に取り外す」表示が出なくなった時は、設定の変更や再起動で戻ることがあります。外付けHDDはキャッシュ書き込みの影響もあるので、突然抜かずに取り外しを習慣化するとトラブルが減りました。4TB HDDはコスパが良いので、設定さえ整えば本当に快適です。

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