Cannot activate mass storage mode from n73?

Question

whenever i choose mass storage mode in connecting my nokia n73 to a pc, a message appears something like this " cannot activate mass storage some application is in use from memory card"

Answer 1

An application running on your phone is keeping files opened on the memory card. It could be the Media Gallery or any other application but my favourite suspect is the Messaging app.

See which applications are running (long press the menu key) and close them. You cannot close the Messaging application but you can change its settings to store the messages on the phone memory instead of the memory card. See Messaging->Options->Settings->Other

See phone's user guide for more details.