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gptgen is a command-line utility developed by xorange (Karl Lenz) that performs an in-place conversion of legacy MS-DOS style MBR (Master Boot Record) partitioned disks to the modern GPT (GUID Partition Table) layout without destroying existing data. Released in two successive versions culminating in the current 1.3 build, the program is aimed primarily at system administrators, dual-boot enthusiasts, and anyone preparing older hardware for UEFI-only operating systems or disks larger than 2 TB. By rewriting only the partition metadata and protective MBR while leaving file-system clusters untouched, gptgen allows Windows, Linux, or other installations to remain fully bootable after conversion, provided the underlying firmware is switched to UEFI mode and the OS itself supports GPT. Typical use cases include migrating a Windows 7/10 system drive to GPT before a seamless upgrade to Windows 11, repurposing multi-partition data drives for modern NAS appliances that require GPT, or enabling Advanced Format disks on machines whose BIOS otherwise caps addressable space at 2 TB. The utility runs from an elevated prompt, generates a backup of the original partition table for rollback safety, and verifies alignment constraints to ensure 4 K sector compatibility. Because it operates at a low level, users are advised to have a complete backup and recovery media ready, yet the tool’s conservative approach has made it a lightweight, scriptable alternative to full-disk imaging followed by destructive re-partitioning. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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