I believe the problem is actually in gnome-disks, not Nautilus. When I launch gnome-disks directly and attempt to format either a single partition of a USB stick or the whole drive, the format does nothing and I see an error message like this:
Error formatting disk
Error synchronizing after initial wipe: Timed out waiting for object (udisks-error-quark, 0)
This is still broken in Trusty.
Nautilus is invoking gnome-disks like this:
gnome-disks --block-device /dev/sdb1 --format-device --xid 39846040
I believe the problem is actually in gnome-disks, not Nautilus. When I launch gnome-disks directly and attempt to format either a single partition of a USB stick or the whole drive, the format does nothing and I see an error message like this:
Error formatting disk error-quark, 0)
Error synchronizing after initial wipe: Timed out waiting for object (udisks-