Contax U4R ユーザーズマニュアル

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EN-150
Disconnecting the USB cable from a Macintosh
Drag the [untitled] (Mac OS 9) or [NO_NAME] (Mac OS X) folder on the 
desktop to the Trash. Check that the "It is now safe to disconnect the 
device" message is displayed or that the [untitled] (Mac OS 9) or 
[NO_NAME] (Mac OS X) icon is no longer displayed on the desktop before 
disconnecting the USB cable.