I used to have one of those several years ago on my A500+ with turboboard, it costed me 112,50 euro in those days when it was still brandnew. I don´t really know what the Dell sign means, I only know that when you have 2.0 kickstart or higher that it is recognized as high density drive. The only funny minor thing is that it refused to work when I connected it to another external drive, it only worked when connected directly to the floppy port :-)
