How to Prepare a USB Drive for Safe RemovalShows the link between a drive letter, its disk number, and the disk's device instance Download demo project - 5.15 KB Introduction Removing a USB drive using the Windows tray icon is easy, especially if you single left-click it, but sometimes, it's useful to do it from your program. Background There are some samples around, but the ones I saw were searching for the volume and then calling CM_Get_
GUID_DEVINTERFACE_FLOPPY - Windows drivers
https://support.microsoft.com/ja-jp/help/163920
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