Why could Atomix/Atomic be copied on some disk drives?

[LittleSandra88]

Dear all =)

There is a puzzle game called Atomix (the title says Atomic), which I couldn't copy on my A500, but one from my school back then had an A1000, and he could copy it with XCopy. It gave tons of errors while coping it, and it took forever, but it ended up in a working copy.

I have since heard that XCopy could copy some MFM protected games, which I can't quite understand how that would work. The code in the game expects the disk encoding to be in a certain way, so if XCopy changed it, how would the game be able to decode it correctly?

I am 99% sure he didn't knew anything about what the different copy options were.

Can anyone give an explanation why this MFM protected could be copied on some drives?

Hugs,
Sandra =)