usbd_mass_storage is used at run time in 3 crates. It is a direct run-time dependency in 2 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) usbd_mass_storage version
110 1 usbd_bulk_only_transport ^0.1.0
2 usbd_scsi ^0.1.0
feather-f405 dev ^0.1