# Disk ## Disk Attributes These attributes may be used for any disk related operation. | Attribute | Type | Description | Examples | Stability | |---|---|---|---|---| | `disk.io.direction` | string | The disk IO operation direction. | `read` |  | --- `disk.io.direction` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | |---|---|---| | `read` | read |  | | `write` | write |  |