I'm using MQX 3.5.1 with USB Host, at first for testing USB, I have used the \mfs\examples\mfs_usb demo. In this demo using printf on the UART0 I had never seen the Detach event.
If there is a mass storage I see only Attach Event and Intf Event but when I remove my mass storage from the host the Detach event doesn't appear. This is strange so without the Detach event the filesystem isn't uninstalled.
Thanks for the support.