On Mac OS 10.1.2 or later, Toast 5.1 or later and Jam 5 or later only supports USB drives that follow the Mass Storage standard.
If the drive allows you to read CD's and DVD's, Toast 5.1 and Jam 5 should work.
All other USB recorders require a driver update from the original vendor in order to be supported in Mac OS 10.1.2 or later before installing Toast or Jam