From "VCR troubleshooting & repair" by Capelo, Gregory R; Brenner, Robert C
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Presently, only metal heads can be used to record on metal tape. Ferrite heads can play back a prerecorded signal from metal tape, but cannot record on the metal tape.
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This does not apply to SVHS though, as SVHS tape is cobalt-doped ferric tape (BASF also offered chrome tape), so it is basically Type II tape in audiocassette terms. It it is known that cheap audiocassette recorders meant for Type I tape only did crappy recordings when Type II tape was used.