Application SD 到 USB Host

sequenceDiagram
participant UI
participant U as USB Runtime
participant O as Owners
participant SD
participant M as MSC
UI->>U: start
U->>O: quiesce/flush
U->>SD: unmount
U->>M: start
UI->>U: stop
U->>M: stop
U->>SD: remount
U->>O: resume