Win 10 LTSB here.
<All> USB drives (including my Garmin 920 GPS sport watch) are seen as "raw". The OS then prompts to format them. All these drives work perfectly in Linux, and other installations of Windows (all formatted in FAT32) so it's not the drives. I took an empty USB drive and tried to format it and got a message it couldn't be formatted. The diskmgmt utility sees the drives as RAW (healthy, active, primary partition). The diskpart utility provides the same information and result as diskmgmt, as it appears that dskmgmt is a GUI front end for diskpart.
I've searched a lot elsewhere for this problem, and all could find was answers to specific instances of a single drive showing up as raw, not a case where <all> of them do and format fails. So I'm here hoping to find a solution other than a silly reinstall.