Aigo UM-F158 - Manual (Page 31)

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! Reference: The player will automatically create a VOICE/FM
Folder when you record.
2 Pulling out the USB Cable
While files are being transmitted, the message “Writing” will be
displayed on the LCD. Avoiding disconnecting the player at this
time, or you will need to use Firmware Recover.
After the files are transmitted, close My Computer or Files
Management.
If you are using WIN98, you can operate as follows: