I remember back in the day, there were lots of different sector editors out there, some good, some not so good. I had one that was awesome, but I forgot the name. I have looked everywhere for it. I remember it supports double density, it also allows bit manipulation of the buffer. For example, if there is text XORd with a number, it is possible to read it, and even edit it.
It loads under Sparta, but the directory / vtoc / link functions only work under AtariDOS and compatibles. It has pattern search, and + - (or maybe arrows) next / previous sector scan.
If anyone remembers this great tool, please let me know. I need it for a project or two.
Thanks!
-Kyle