How to Resolve a Superblock Error When Mounting a Partition in Red Hat
This EX200 practice question tests your understanding of create and configure file systems. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
# parted /dev/sdc print
Error: /dev/sdc: unrecognised disk label
# lsblk /dev/sdc
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdc 8:32 0 20G 0 disk
# fdisk -l /dev/sdc
Disk /dev/sdc: 20 GiB, 21474836480 bytes, 41943040 sectors
Disk model: Virtual Disk
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 41943039 41940992 20G 83 Linux
# blkid /dev/sdc1
/dev/sdc1: UUID="abcdef12-3456-7890-abcd-ef1234567890" TYPE="xfs"
# mount /dev/sdc1 /mnt/backup
mount: /mnt/backup: can't read superblock on /dev/sdc1.
Refer to the exhibit. An administrator tries to mount the partition /dev/sdc1 and gets a superblock error. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Exhibit
# parted /dev/sdc print
Error: /dev/sdc: unrecognised disk label
# lsblk /dev/sdc
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdc 8:32 0 20G 0 disk
# fdisk -l /dev/sdc
Disk /dev/sdc: 20 GiB, 21474836480 bytes, 41943040 sectors
Disk model: Virtual Disk
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 41943039 41940992 20G 83 Linux
# blkid /dev/sdc1
/dev/sdc1: UUID="abcdef12-3456-7890-abcd-ef1234567890" TYPE="xfs"
# mount /dev/sdc1 /mnt/backup
mount: /mnt/backup: can't read superblock on /dev/sdc1.
A
The filesystem is not recognized; need to install xfsprogs
Why wrong: blkid shows the filesystem type as xfs, so xfsprogs is likely installed; the error is about superblock, not unknown fs.
B
The partition table is corrupted
Why wrong: fdisk shows a valid partition table and the partition exists.
C
The filesystem has not been created; mkfs.xfs was not run
Although blkid shows a UUID and type, the superblock error indicates the filesystem is not valid. This can happen if the partition was created but not formatted, yet blkid might show leftover metadata. Typically, you must run mkfs.xfs to create the filesystem.
D
The mount point /mnt/backup does not exist
Why wrong: The error message does not indicate a missing mount point; it says 'can't read superblock'.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The filesystem has not been created; mkfs.xfs was not run
The superblock error indicates that the kernel cannot read the filesystem metadata at the start of the partition. This most commonly occurs when no filesystem has been created on the partition — i.e., mkfs.xfs was never run on /dev/sdc1. Without a valid filesystem superblock, the mount command fails with a 'wrong fs type, bad option, bad superblock' message.
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.
✗
The filesystem is not recognized; need to install xfsprogs
Why it's wrong here
blkid shows the filesystem type as xfs, so xfsprogs is likely installed; the error is about superblock, not unknown fs.
✗
The partition table is corrupted
Why it's wrong here
fdisk shows a valid partition table and the partition exists.
✓
The filesystem has not been created; mkfs.xfs was not run
Why this is correct
Although blkid shows a UUID and type, the superblock error indicates the filesystem is not valid. This can happen if the partition was created but not formatted, yet blkid might show leftover metadata. Typically, you must run mkfs.xfs to create the filesystem.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The mount point /mnt/backup does not exist
Why it's wrong here
The error message does not indicate a missing mount point; it says 'can't read superblock'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the distinction between a partition existing (created with fdisk/gdisk) and a filesystem existing on that partition (created with mkfs), leading candidates to confuse partition table corruption with a missing filesystem.
Trap categories for this question
Command / output trap
blkid shows the filesystem type as xfs, so xfsprogs is likely installed; the error is about superblock, not unknown fs.
Detailed technical explanation
How to think about this question
The XFS superblock is located at byte offset 0 of the partition and contains critical metadata such as the filesystem size, block size, and UUID. When mkfs.xfs is run, it writes this superblock along with the root inode and allocation group headers. A superblock error can also occur if the filesystem is damaged, but in a pristine partition (no mkfs), the kernel reads garbage or zeros and fails to validate the magic number (0x58465342 for XFS).
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 EX200 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.
Create and configure file systems — This question tests Create and configure file systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The filesystem has not been created; mkfs.xfs was not run — The superblock error indicates that the kernel cannot read the filesystem metadata at the start of the partition. This most commonly occurs when no filesystem has been created on the partition — i.e., mkfs.xfs was never run on /dev/sdc1. Without a valid filesystem superblock, the mount command fails with a 'wrong fs type, bad option, bad superblock' message.
What should I do if I get this EX200 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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