Usable USB Flash Drives
No advance preparations such as setting up a network or configuring the system are required as the 'Scan to USB' function stores the data on a USB flash drive connected to the system.
Check that the USB flash drive being used complies with the standards below.
USB standard: USB 2.0
File format: FAT or FAT32
in the upper-right of a page, it turns into 
and is registered as a bookmark.