That was my experience too. The D type worked very well for me.I agree that recording quality wise they are not as good as type II or IV, but LOTS (and I mean LOTS) of folks used type I's to record music back in the day, including record labels.
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Welcome to AudioKarma and thanks for your reply. My experience was similar to yours.I disagree with those suggesting that these are only suitable for the trash. I've made good recordings on TDK D tapes from most generations. ...
I also dubbed records and later Compact Discs to TDK - D tapes to play in my car in the era before car CD players. Like you, I never had one fail.In defense of the TDK Ds, they were great tapes for use in my car. I always made 2 tape copies of my albums back in the day. One for home use (TDA-SA or Maxell XL II) and one TDA-D version for the car. Never had a TDK D fail in the less than idea car environment.