There's two cautionary lessons here, and I've found (anecdotally) that they respond to two schools of thought. One is: The signage should have been more thoroug

There's two cautionary lessons here, and I've found (anecdotally) that they respond to two schools of thought. One is: The signage should have been more thorough, specifying what domain-expert was required to remove its restrictions and enable writes. The other is: The DEC Engineer should have known that while he was a domain expert in tape-drives, he did not have knowledge of why that sign had been put there in the first place, and should have done some non-invasive diagnostics before removing it (or just asked). He made an assumption about why there was a taboo, but did not check it.