Check that the USB connection to the computer is made properly.

You may not be able to transfer content when using a USB hub. Connect directly to the USB connector on your computer.

There is not enough free space in your Walkman, or the number of files has exceeded the maximum number of transferable files. Delete any unnecessary content to increase free space. For details on the recordable number, see following.

• “Maximum recordable number of songs and time (Approx.)”

Songs with a limited playing period or playing count may not be transferred due to restrictions set by copyright holders. For details on the settings of each audio file, contact the distributor.

Some of the content on your Walkman may be damaged. Return required content to the computer and initialize (format) the Walkman.

If the software is not compatible with your Walkman, install compatible software and use the compatible software to transfer content.

You may be attempting to transfer corrupted content. Delete the content that cannot be transferred from the computer, and import this content into the computer again. Do not perform any other tasks on the computer when transferring content to your computer. Doing so may cause the content to corrupt.

You may be attempting to transfer a file that is not in playable format. Check the “Supported formats.”