Sony MHC-V73D Help Manual page 168

Help Guide
Home Audio System
MHC-V73D
Audio files or folders on the USB device cannot be erased.
Check if the USB device is write-protected.
The USB device was disconnected or the power was turned off during the erase operation. Delete the partially-
erased file. If this does not fix the problem, the USB device may be broken. Refer to the operating instructions of the
USB device on how to deal with this problem.
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