220-1201 Practice Question: A technician is troubleshooting a PC that boots…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  The SSD is not properly connected to the SATA port.

  Why it's wrong here

  If the SSD were not properly connected to the SATA port, the BIOS/UEFI would typically fail to detect the drive entirely, resulting in a 'No bootable device found' or similar error message. The 'INACCESSIBLE_BOOT_DEVICE' stop code specifically indicates that the system *recognized* a boot device but encountered a critical issue when attempting to access its contents, pointing to a logical or configuration problem rather than a physical disconnection.

• ✗

  The boot order is set to the HDD instead of the SSD.

  Why it's wrong here

  An incorrect boot order, where the system attempts to boot from an unbootable or non-existent HDD before the SSD, would typically lead to a 'No bootable device' error after exhausting all options, or it would simply boot from the next available device. The 'INACCESSIBLE_BOOT_DEVICE' error occurs *after* the system has successfully identified the intended boot device (the SSD) but fails to load the operating system from it due to a fundamental incompatibility or missing driver, not merely an incorrect sequence.

• ✓

  The SATA controller mode in BIOS is set to IDE, but the SSD requires AHCI.

  Why this is correct

  Modern SSDs are designed to operate optimally and correctly under AHCI (Advanced Host Controller Interface) mode, which enables crucial features like Native Command Queuing (NCQ) and hot-plugging. If the operating system was installed or cloned while the SATA controller was in IDE compatibility mode, and then the BIOS setting is switched to AHCI (or vice-versa), the necessary storage drivers will not load. This driver mismatch prevents the OS from communicating with the SSD effectively, resulting in the 'INACCESSIBLE_BOOT_DEVICE' stop code.

• ✗

  The SSD is not partitioned correctly.

  Why it's wrong here

  An incorrectly partitioned SSD, or one lacking a valid bootable partition, would typically result in a 'No bootable device found' message or a similar error indicating the absence of a valid boot sector or operating system. The 'INACCESSIBLE_BOOT_DEVICE' error specifically implies that the system *found* a bootable partition and attempted to load from it, but failed due to an underlying driver or controller configuration issue, not a missing or malformed partition structure itself.

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