Disk formatting is the process of writing a file system structure, such as NTFS, exFAT, FAT32, ext4 or APFS, onto a drive or partition so the operating system can store and find files. A quick format rebuilds the file table, while a full format also checks for bad sectors.
Why it matters
A new drive is unusable until formatted, and the file system you choose decides compatibility. FAT32 works almost everywhere but cannot hold a single file over 4 GB. exFAT suits USB drives shared between Windows and macOS. NTFS is the Windows default, and ext4 is common on Linux. Formatting is also used to wipe a drive before reuse.
Example
Formatting a USB stick on Linux:
sudo mkfs.exfat -n SHARED /dev/sdb1Choosing the wrong device name here would erase the wrong disk, so always double-check with lsblk first.
Common mistakes
- Assuming a quick format securely erases data. Files can often be recovered until overwritten; secure erasure needs different tools.
- Formatting the wrong drive because of unclear labels.
- Using FAT32 for large video files and hitting the 4 GB limit.
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