[Solved] You run fdisk /dev/sda but get an error: "Device or resource busy." What is the most likely cause? — Ans: The disk is mounted or in use by the system | Linux CLI

Linux CLI - Disk and Storage

You run fdisk /dev/sda but get an error: "Device or resource busy." What is the most likely cause?

AThe disk is physically disconnected

Bfdisk command is not installed

CYou typed the device name incorrectly

DThe disk is mounted or in use by the system

Step-by-Step Solution

Solution:

Step 1: Analyze the error message
"Device or resource busy" means the disk is currently used or mounted.
Step 2: Check other options
If fdisk was missing, command wouldn't run; wrong device name gives different error; disconnected disk won't show as busy.
Final Answer:
The disk is mounted or in use by the system -> Option D
Quick Check:
Busy device means disk is in use [OK]

Quick Trick: Busy device error means disk is mounted or used [OK]

Common Mistakes:

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You run fdisk /dev/sda but get an error: "Device or resource busy." What is the most likely cause?