This LPIC-1 practice question tests your understanding of administrative tasks. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which three actions can an administrator take to securely erase data on a disk before decommissioning?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run dd if=/dev/urandom of=/dev/sda.
Option C is correct because using `dd if=/dev/urandom of=/dev/sda` overwrites the entire disk with random data from the kernel's non-blocking random number generator. This makes the original data unrecoverable through forensic techniques, as each sector is overwritten with unpredictable values, effectively destroying any residual magnetic traces.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Format the disk with mkfs.
Why it's wrong here
Formatting only overwrites the filesystem metadata; data can often be recovered.
✗
Delete the partition and create a new one.
Why it's wrong here
Deleting partitions only removes the partition table; data remains on the disk.
✓
Run dd if=/dev/urandom of=/dev/sda.
Why this is correct
Overwrites the entire device with random data, making recovery extremely difficult.
Related concept
Read the scenario before looking for a memorised answer.
✓
Run shred -n 3 /dev/sda.
Why this is correct
Shred overwrites the device multiple times with random patterns.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use the hdparm command with the --security-erase option.
Why this is correct
Hdparm can issue an ATA secure erase command to the drive, which wipes all data.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think `mkfs` or partition deletion fully erases data, when in fact they only remove logical pointers, leaving the raw data recoverable with simple forensic tools.
Detailed technical explanation
How to think about this question
Under the hood, `dd if=/dev/urandom` reads from the kernel's entropy pool, which uses environmental noise (e.g., device interrupts, keystroke timings) to generate cryptographically strong random bytes. For SSDs, the `hdparm --security-erase` option (Option E) is often more effective because it issues an ATA SECURITY ERASE UNIT command, which triggers the drive's internal garbage collection to physically erase all NAND cells, including over-provisioned areas that `dd` cannot reach. In real-world scenarios, a single pass with `/dev/urandom` is sufficient for HDDs, but regulators like NIST recommend multiple passes for classified data.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the LPIC-1 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Administrative Tasks — This question tests Administrative Tasks — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run dd if=/dev/urandom of=/dev/sda. — Option C is correct because using `dd if=/dev/urandom of=/dev/sda` overwrites the entire disk with random data from the kernel's non-blocking random number generator. This makes the original data unrecoverable through forensic techniques, as each sector is overwritten with unpredictable values, effectively destroying any residual magnetic traces.
What should I do if I get this LPIC-1 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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