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Device configuration overlay (DCO) is a hidden area on many of today's hard disk drives (HDDs). Usually when information is stored in either the DCO or host protected area (HPA), it is not accessible by the BIOS (or UEFI), OS, or the user.
Memory protection is a way to control memory access rights on a computer, and is a part of most modern instruction set architectures and operating systems.The main purpose of memory protection is to prevent a process from accessing memory that has not been allocated to it.
Computer manufacturers may use the area to contain a preloaded OS for install and recovery purposes (instead of providing DVD or CD media). Dell notebooks hide Dell MediaDirect utility in HPA. IBM ThinkPad and LG notebooks hide system restore software in HPA. HPA is also used by various theft recovery and monitoring service vendors.
Given below are some solutions to resolve the issue. After trying the first solution, check whether the issue is resolved. If the status still shows "Your computer is not fully protected," try the suggested solutions until the issue is resolved. Run the automatic fix
In computing, protected mode, also called protected virtual address mode, [1] is an operational mode of x86-compatible central processing units (CPUs). It allows system software to use features such as segmentation, virtual memory, paging and safe multi-tasking designed to increase an operating system's control over application software.
The IBM PC AT provided the hardware to do this (for full backward compatibility with software for the original IBM PC and PC/XT models), and so all subsequent "AT-class" PC clones did as well. 286 protected mode was seldom used as it would have excluded the large body of users with 8086/88 machines.
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