You can store computer data into the built-in flash memory of the player by
transferring the data from your computer using Windows Explorer, or another
transfer capable software. If the player is connected to the computer, the built-
in flash memory appears in Windows Explorer as [WALKMAN.]
Do not disconnect the supplied USB cable while transferring data between a computer
and the player because the data being transferred could be damaged.
Do not format the built-in flash memory using Windows Explorer. If you format the
built-in flash memory, format it on the player ( page 88).