Yes, that's right - the opposite to the usual.
I have an old external HDD that until a recent Win10 update was seen by Defraggler as an HDD, and was therefore defragg-able. Lately, though, it is being seen as an SSD, and I foolishly "optimised" it, using Defraggler. The drive is now almost filled up with "dfoptimize_nn.bin files (where "nn" is one or more numerals).
2 questions, then:
1. Can I safely delete these files?
2. How can I get Defraggler to treat it as a normal HDD?