To avoid corrupting data, do not disconnect the USB data cable during data transfer.
Transfer data between your device and a PC
Insert a memory card in your device, and connect the device to a compatible PC with the data cable.
When the device asks which mode to use, select Mass storage. In this mode, you can see your device as a removable hard drive in your computer.
End the connection from the computer (from the Unplug or Eject Hardware wizard in Microsoft Windows, for example) to avoid damaging the memory card.
To use Nokia Ovi Suite with your device, install Nokia Ovi Suite on your PC, connect the data cable, and select PC Suite.
To synchronize the music in your device with Nokia Ovi Player, install the Nokia Ovi Player software on your PC, connect the data cable, and select Media transfer.
To change the USB mode you normally use with the data cable, select Menu > Ctrl. panel > Connectivity > USB and USB connection mode, and the desired option.
To set the device to ask for the mode each time you connect the data cable to the device, select Menu > Ctrl. panel > Connectivity > USB and Ask on connection > Yes.