Windows Setup fails due to conflicting partition tables (MBR vs GPT mismatch)

The problem: Setup refuses installation because the existing partition table format doesn't match the installation method (UEFI/BIOS mismatch).

Symptoms: Setup error about partition table; 'Cannot install on this disk'; MBR/GPT incompatibility message; conversion fails.

Likely cause: Drive has MBR partition table but UEFI/BIOS setup expects GPT; drive has GPT but BIOS Legacy mode selected; mixed MBR/GPT partitions on drive.

Category: Windows Installation & Setup · Difficulty: Advanced · Windows: Both

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