Canon MX720 series Online Manual page 186

If the USB flash drive becomes full while scanning images is in progress, only the images
already scanned can be saved.
You can save up to 2000 files of scanned data in both PDF and JPEG data format.
The folder and file name of scanned data saved on the USB flash drive is as follows:
Folder name: (file extension: PDF): CANON_SC\DOCUMENT\0001
Folder name: (file extension: JPG): CANON_SC\IMAGE\0001
File name: Running numbers, starting from SCN_0001
File date: The date and time of saving as set in the machine.
For details on how to set the date and time:
Setting the Sender Information
• Importing the Scanned Data Saved on a USB Flash Drive to the Computer
You can import the scanned data saved on a USB flash drive to the computer. After scanning the data,
connect the USB flash drive to the computer, then import the data.