Question 449 of 527
LPIC-1 System Architecture Practice Question
During boot, a sysadmin sees the message 'Buffer I/O error on device sda1, logical block 0'. What does this most likely indicate?
⚠ Common exam trap
Watch out — candidates often confuse a low-level block I/O error with filesystem corruption (Option B), but the error originates from the disk hardware layer, not the filesystem layer, and the specific mention of 'logical block 0' points to a physical sector issue rather than a logical structure problem.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Bad sector on the disk
The 'Buffer I/O error on device sda1, logical block 0' message indicates that the kernel's block layer failed to read or write the first logical block (LBA 0) of the partition. This is a classic symptom of a physical bad sector on the disk surface, as the storage medium itself cannot reliably store or retrieve data at that location. Filesystem corruption or partition table issues would typically produce different error messages, such as 'invalid superblock' or 'partition table invalid'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Incorrect partition table
Why it's wrong here
Incorrect partition table would cause partition identification errors.
- ✗
Filesystem corruption
Why it's wrong here
Filesystem corruption usually produces fsck-related messages.
- ✓
Bad sector on the disk
Why this is correct
I/O error on a specific block suggests hardware failure.
- ✗
Missing kernel module for the device
Why it's wrong here
Missing module would prevent the device from being recognized.
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Last reviewed: Jul 4, 2026
This LPIC-1 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-1 exam.
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