Reference
Your “WALKMAN” is not recognized as USB storage.
- The USB connection is turned off.
-
Swipe the status bar, then tap [USB connected] on the notification panel followed by [Turn on USB storage] then [OK].
- USB debugging is enabled.
-
Some devices or software may not recognize your “WALKMAN” when USB debugging is enabled. Tap the
(Menu) button, then tap [
Settings] - [
Applications] - [Development] - [USB debugging] and uncheck the box.