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MBR2GPT can not convert? How to solve safely!

MBR2GPT is convenient, but there should be many people who are troubled that they cannot convert due to errors.

It may be due to non-UEFI support, BitLocker encryption, and layout incompatibility.

In such a case, Partition Assistant, easy conversion without erasing the data even for beginners!

Avoid failures and safely convert from MBR to GPT.

# MBR2 GPT Can't convert # Windows 10 # GPT Partition Management

2025/9/28 Edited to

... Read more私も以前、MBR2GPTを使ってWindowsのパーティションをGPTに変換しようとした際、"変換できない"というエラーに直面しました。特にUEFI非対応のPCやBitLockerで暗号化されたディスクの場合、うまく変換できず焦った経験があります。 そこでおすすめしたいのが、Partition Assistantというフリーソフトです。このソフトは直感的な操作画面で、初心者でもデータを消さずに安全にMBRからGPTへ変換が可能。私もこの方法でトラブルを回避できました。 実際の手順としては、まずBitLockerの解除を忘れずに行います。次にPartition Assistantをダウンロードし、ソフトの指示に従い数クリックで変換が完了しました。特に"disk sector size is: 512 bytes"のようなディスク情報も自動で検出してくれるので安心です。 また、WindowsのコマンドプロンプトでMBR2GPTを使う際には、"/validate"や"/allowfullos"のオプションを正しく指定することも重要です。もし"cannot find os partition(s) for disk"というエラーが出た場合も、Partition Assistantを使うことで簡単に解決できるでしょう。 私の体験から言うと、専門的な知識がなくてもこのソフトを利用すれば安全にパーティション変換ができるので、同じように困っている方にはぜひ試してほしいです。なお、変換前には必ず重要なデータのバックアップを取ることをおすすめします。

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