GUID – gpt and EFI

IBM Service partition – and other partition types, .. are being replaced (gradually) – reference; GUID_Partition_Table and the EFI (Extensible Firmware Interface)

The Extensible Firmware Interface (EFI) is a specification that defines a software interface between an operating system and platform firmware. EFI is a much larger, more complex, OS-like replacement for the older BIOS firmware interface present in all IBM PC-compatible personal computers. The EFI specification was originally developed by Intel, and is now managed by the Unified EFI Forum.

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