System command

online command

Takes an offline disk or volume to the online state. This guide lists the documented syntax and parameters for online; check Microsoft Learn for version, role and execution-context requirements.

Availability: Microsoft Learn command reference spanning Windows client and Windows Server releases; some entries are legacy, role-specific, optional-feature or interactive subcommands.中文

Documented syntax

online disk
online volume

The linked Microsoft Learn article is the upstream authority. Availability may depend on Windows release, role, optional feature or interactive tool context.

Syntax pattern

Syntax pattern from Microsoft Learn; replace placeholders and choose only one documented alternative before use.

online disk

Safety note

Review a command and its target before running it. Commands that alter files, services, accounts, disks, permissions or databases may be difficult to reverse. Test in a safe environment and keep backups.

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