How do I connect a USB Hard Drive for recording?
Connect the USB Hard Drive to one of the USB connections on the TV, switch on both the drive and the TV, then press Pause while tuned to a digital TV channel to begin the formatting process. Formatting removes all files from the USB Hard Drive, so ensure there is no important data on it before proceeding. Once formatted, leave the USB Hard Drive connected permanently.
From the official Sony WH-1000XM4 Wireless Noise-Canceling Headphones manual, page 22
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