https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575287#M30108 <P>These gizmos can and do fail. Try using the troublesome one on a computer.</P> <P>But.....even if it works on a computer, it should not be trusted. Toss it.</P> <P>Buy another one. They're cheap.</P> <P>&nbsp;</P> Sat, 15 Nov 2025 19:50:55 GMT normadel 2025-11-15T19:50:55Z https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575025#M30091 <P>My new MF663 printer has some problems, so as a workaround I thought I would print my file to a PDF and print that from a USB stick.</P><P>I have two identical USB sticks: PNY 16GB FAT32. Both work fine on my Windows PC, but the printer refuses the other one: "An unsupported USB device is connected". ScanDisk finds no problem with the stick. How can I troubleshoot/resolve this?</P> Thu, 13 Nov 2025 23:09:29 GMT https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575025#M30091 LarsPoulsen 2025-11-13T23:09:29Z https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575161#M30099 <P>How is the USB stick formatted? What Windows version do you have? Please answer these questions and we can go from there.&nbsp;</P> Fri, 14 Nov 2025 23:12:37 GMT https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575161#M30099 normadel 2025-11-14T23:12:37Z https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575166#M30101 <P>Right off hand I don't recall all the supported formats but I believe fat32, exFat and NTFS work.&nbsp; I just tried with NTFS and it works fine on my MF656....</P> <P>&nbsp;</P> Fri, 14 Nov 2025 23:37:10 GMT https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575166#M30101 shadowsports 2025-11-14T23:37:10Z https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575176#M30105 <P>As mentioned up top, it is formatted FAT32. The puzzling thing is that it fails, while its brother works fine. It is likely to be something with the specific stick; just strange that I can't find anything wrong with it.</P> Sat, 15 Nov 2025 00:51:41 GMT https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575176#M30105 LarsPoulsen 2025-11-15T00:51:41Z https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575287#M30108 <P>These gizmos can and do fail. Try using the troublesome one on a computer.</P> <P>But.....even if it works on a computer, it should not be trusted. Toss it.</P> <P>Buy another one. They're cheap.</P> <P>&nbsp;</P> Sat, 15 Nov 2025 19:50:55 GMT https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575287#M30108 normadel 2025-11-15T19:50:55Z https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575308#M30112 <P>Oh, it works on my Windows-11 desktop - and SCANDISK finds no problem on it.</P> Sat, 15 Nov 2025 23:31:51 GMT https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575308#M30112 LarsPoulsen 2025-11-15T23:31:51Z https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575368#M30114 <P>You are always taking a risk of failure with these things, and if it has been a problem for any device, take that as early notice.</P> Sun, 16 Nov 2025 16:52:14 GMT https://community.usa.canon.com/t5/Office-Printers/New-Canon-MF663Cdw-printer-will-not-mount-USB-stick/m-p/575368#M30114 normadel 2025-11-16T16:52:14Z