Windows users have reported that UDF drives, including UDF formatted RED MINI-MAGS, will not mount onto their machines after the latest Windows updates below
Microsoft is aware of this issue impacting all UDF formatted devices and is working towards a fix. Please contact Microsoft support for the latest update.
Solution: Roll back to a version of Windows preceding the November 22, 2021 updates or use FAT32 format in-camera until Microsoft resolves this issue. For assistance rolling back your Windows OS, please contact Microsoft support, here.