How many failed drive we have got so far?
This is a good idea though for root cause investigating, however, Are we capable and ready to do so?
BTW, if the suspected root cause is “LSI AE”, then, why do we need to check by applying Magnetic field to prove on.
Can we do just try apply voltage and measure the preamp gain directly to this AE unit (measuring pad-by-pad to see any different between gain applied for each particular Head)??
Please considering the simple and effective way to prove.