Many users believe the device is broken. The recorder works perfectly. The issue is that Microsoft changed the USB stack significantly after Windows 7. Sony discontinued support before Windows 8 or 10 existed.
The USB cable may be a "charging-only" cable. Try 5 different cables. Also, some ICD-PX720 units have a failing USB port—common after years of use. sony icd-px720 driver windows 10
Share your experience in the comments below. Legacy hardware deserves a community-driven future. Many users believe the device is broken
The recorder must have working batteries even when connected via USB to be properly detected. sony icd-px720 driver windows 10