ArcaOS 5.1 (the latest modern version of OS/2) is currently available, with the most recent maintenance release being ArcaOS 5.1.2 , released on March 9, 2026 Key Features of ArcaOS 5.1 Modern Hardware Support : This release is the first version to support GPT partitions

Includes support for GPT (GUID Partition Table) layouts, removing the historical 2TB disk limit for physical drives.

Why go through the hassle of an ISO this old? Because ArcaOS fills a gap no other OS can:

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hardware without needing a "Compatibility Support Module" (CSM). GPT Disk Support: