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Difficulty: MediumTroubleshooting Windows OS Startup and Boot Errors

A field technician is troubleshooting a Windows workstation configured with a legacy MBR partition scheme that fails to boot, displaying the error message 'Invalid partition table' on a black screen. Upon booting into the Windows Recovery Environment (WinRE) Command Prompt, which TWO of the following troubleshooting actions should the technician perform to repair the boot structure and make the primary drive bootable? (Select TWO.)

  1. Run bootrec /fixmbr to repair the corrupted Master Boot Record code on the system partition.Answer
  2. Use diskpart to select the primary system partition and mark it as active.Answer
  3. C
    Run bootrec /rebuildbcd to recreate the EFI System Partition bootloader configuration.
  4. D
    Execute sfc /scannow to replace corrupted Windows kernel binaries from the recovery image.

Answer

The technician must execute `bootrec /fixmbr` to repair the Master Boot Record code and use `diskpart` to set the primary partition as active.
An 'Invalid partition table' error on a legacy MBR system signifies either corruption in the Master Boot Record or that no drive partition is designated as active. Running `bootrec /fixmbr` writes a compatible MBR to the system partition to correct MBR boot code corruption. Using `diskpart` to set the Windows system partition to 'active' allows the BIOS to hand off boot control to the partition containing boot files.

Step-by-Step Solution

1
Analyze the error message 'Invalid partition table' on a legacy MBR system.
Identified that either the MBR boot code is damaged or no partition on the disk is flagged as active.
Legacy BIOS systems require an active partition flag in the partition table to locate bootable startup files.
2
Boot into the WinRE Command Prompt and execute bootrec /fixmbr.
The Master Boot Record's main boot code is rewritten.
This fixes corrupted MBR code without affecting the underlying partition table structure or user data.
3
Launch diskpart, select the primary OS volume, and execute the 'active' command.
The partition is marked active in the partition table.
Directs the system boot sequence to look for OS boot files on that specific partition.

Key Concept

Troubleshooting Legacy MBR Boot Failures and Active Partition Flags
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Topics

Troubleshooting Windows OS Startup and Boot Errors

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