Comment 14 for bug 1294877

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Martin Pitt (pitti) wrote : Re: usb-creator fails to wipe usb device when the device has ext4 partition

That's not a bug in udisks. As the error message says, an empty "erase" value is invalid, you need to specify a mode:

http://udisks.freedesktop.org/docs/latest/gdbus-org.freedesktop.UDisks2.Block.html#gdbus-method-org-freedesktop-UDisks2-Block.Format