Sony WALKMAN NW-WM1A Help Manual page 69

Confirm that the transfer is complete. Then, disconnect the Walkman from the computer.
Note
Operation may not be guaranteed depending on the version of iTunes.
Do not disconnect the USB cable during data transfer. Otherwise, the data may be damaged.
Transferred content is limited to private use only. Use of content for other purposes requires the permission of the copyright holders.
The contents of the Help Guide may be subject to change without notice due to updates to the product's specifications.
Related Topic
Installing Content Transfer (Mac)
Preparing music content
Purchasing High-Resolution Audio content
Playing music
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