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Convert MBR to GPT without Formatting! Safe and Easy Way

Want to convert MBR disk to GPT disk, but do not want to lose data in formatting?

At that time "Partition Assistant"!

You can safely convert to GPT disk with just a few clicks without deleting partitions.

UEFI compatible · HDD / SSD of over 2TB is solved with this!

AOMEI Official 🎉 Free Code: (code.aomeitech.com/jp /)

Discount with coupon "Special 30 OFF"!

# Convert to GPT disk # MBR to GPT # No data loss # UEFI start

2025/10/16 Edited to

... Read more「MBR→GPT変換」って何?と聞かれることが多いので、私がつまずいたポイントも含めて補足します。結論から言うと、GPTにすると2TB超のHDD/SSDをフルに使えたり、UEFI起動(Windows 11要件にも関係)に対応しやすくなります。 ■MBRディスクに変換とは(正確には“変換”) MBRとGPTはディスクのパーティション方式の違いです。MBRは古い方式で、ディスク容量やパーティション数に制限があります。GPTは新しい方式で大容量向け。私の場合、増設した大きめのSSDがMBRのままだと管理しにくくて、GPTに統一したくなりました。 ■Windows標準機能(ディスクの管理)での注意 OCRにもある通り、「ディスクの管理」でGPTに変換しようとすると、パーティションが残っていると項目がグレー表示になることが多いです。つまり“全ボリュームを削除→変換”の流れになりがちで、これは実質データ消去。バックアップがないと危険なので、私はこの方法は避けました。 ■フリーソフトを選ぶときのチェック(私の基準) 同じ検索で「mbr gpt 変換 フリーソフト」や「EaseUS Partition Master」もよく出てきますが、比較するなら次を確認すると安心でした。 ・データディスクだけでなくシステムディスクにも対応するか ・“フォーマット不要” “パーティション削除不要”が明記されているか ・変換前にプレビュー(実行前の確認)ができるか ・トラブル時の復元やサポート情報があるか ■実際にやる前に必ず確認したこと 1) 重要データのバックアップ(念のため) 2) そのディスクが「システムディスク」か「データディスク」か 3) PCがUEFI起動対応か(古いPCだと切替が必要な場合あり) 4) BitLockerなどの“MBR暗号化(ディスク暗号化)”を使っている場合は一時停止/解除が必要なことがある 私は暗号化を使っていたので、変換前にBitLockerの状態を確認してから作業しました。 ■私がよく聞かれるQ&A Q. 変換したらWindowsは起動しなくならない? A. システムディスクを変換する場合、BIOS設定がレガシーのままだと起動しないことがあります。UEFI設定への切替や、環境に合った手順が必要です。 Q. EaseUS Partition Masterとどっちがいい? A. どちらでも“データを消さない変換”が目的なら、対応範囲(システム/データ)、手順の分かりやすさ、無料でできる範囲で決めるのが失敗しにくいです。私は「実行前に変更内容が見える」「クリック数が少ない」点を重視しました。 まとめると、ディスクの管理はデータ削除が前提になりやすいので、データ損失なしでMBR→GPTにしたいなら、フォーマット不要で変換できるツールを選ぶのが現実的でした。作業前のバックアップとUEFI/暗号化の確認だけは、ぜひセットでやってみてください。

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