Windows cipher /w free space equivalent in Linux
Zeros unused blocks on a supported unmounted filesystem.
cipher /w free space
sudo zerofree /dev/sdXn
sudo zerofree /dev/sdXn
sudo zerofree /dev/sdXn
Overview
What this command does
On Windows, "cipher /w free space" is used to zero free space. On Linux, the closest practical mapping shown here is "sudo zerofree /dev/sdXn". Zeros unused blocks on a supported unmounted filesystem. This reference is grouped under System & Storage → Disk Maintenance.
Windows → Linux context
What changes when you use this on Linux?
Equivalent task, different tool
Windows cipher /w free space maps to sudo zerofree /dev/sdXn for this task. Treat this as a workflow mapping rather than a character-for-character syntax translation.
Portable across the compared distros
The Debian/Ubuntu, Fedora and Arch rows use the same command in this mapping. Package availability or defaults can still vary, so check the installed tool version when an option behaves differently.
Elevated privilege appears in this workflow
At least one example uses sudo. Confirm the target path, device, service or package before running the elevated form; do not add sudo simply to bypass an unexplained permission error.
For the broader concept behind this mapping, read Linux disks, storage and mounts.
Practical tasks
Common use cases
Zero free space
Zeros unused blocks on a supported unmounted filesystem.
sudo zerofree /dev/sdXn
Zero free space
sudo --help
Show command help when supported
man sudo
Open the manual page when installed
Ready to run
Copyable Linux commands
Review paths, device names, package names and permissions before running any command.
sudo zerofree /dev/sdXn
Walkthrough
Examples with explanations
# Windows equivalent: cipher /w free space
sudo zerofree /dev/sdXnReference
Common options and variations
| Command or option | Use |
|---|---|
sudo zerofree /dev/sdXn | Zero free space |
sudo --help | Show command help when supported |
man sudo | Open the manual page when installed |
Distro differences
Debian/Ubuntu vs Fedora vs Arch
The command "sudo zerofree /dev/sdXn" is the same in all three rows, while package or base details differ: Debian/Ubuntu uses apt package: zerofree; Fedora uses dnf package: zerofree; Arch uses AUR/extra tool or use filesystem-native methods.
| Distribution | Package manager / base | Equivalent command | Difference to notice |
|---|---|---|---|
| Debian/Ubuntu | apt package: zerofree | sudo zerofree /dev/sdXn |
Same command on this distribution. |
| Fedora | dnf package: zerofree | sudo zerofree /dev/sdXn |
Same command on this distribution. |
| Arch | AUR/extra tool or use filesystem-native methods | sudo zerofree /dev/sdXn |
Same command on this distribution. |
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