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DescriptionUse the chrome.system.storage API to query storage device information and be notified when a removable storage device is attached and detached.
system.storage
"success"
The ejection command is successful -- the application can prompt the user to remove the device.
"in_use"
The device is in use by another application. The ejection did not succeed; the user should not remove the device until the other application is done with the device.
"no_such_device"
There is no such device known.
"failure"
The ejection command failed.
The available capacity of the storage device, in bytes.
A copied id of getAvailableCapacity function parameter id.
The total amount of the storage space, in bytes.
The transient ID that uniquely identifies the storage device. This ID will be persistent within the same run of a single application. It will not be a persistent identifier between different runs of an application, or between different applications.
The name of the storage unit.
The media type of the storage unit.
"fixed"
The storage has fixed media, e.g. hard disk or SSD.
"removable"
The storage is removable, e.g. USB flash drive.
"unknown"
The storage type is unknown.
chrome.system.storage.ejectDevice(
id: string,
): Promise<EjectDeviceResultCode>
Ejects a removable storage device.
getAvailableCapacity()chrome.system.storage.getAvailableCapacity(
id: string,
): Promise<StorageAvailableCapacityInfo>
Get the available capacity of a specified id storage device. The id is the transient device ID from StorageUnitInfo.
chrome.system.storage.getInfo(): Promise<StorageUnitInfo[]>
Get the storage information from the system. The argument passed to the callback is an array of StorageUnitInfo objects.
Events onAttachedchrome.system.storage.onAttached.addListener(
callback: function,
)
Fired when a new removable storage is attached to the system.
ParametersThe callback parameter looks like:
(info: StorageUnitInfo) => void
chrome.system.storage.onDetached.addListener(
callback: function,
)
Fired when a removable storage is detached from the system.
ParametersThe callback parameter looks like:
(id: string) => void
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Last updated 2025-08-11 UTC.
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