"EIDE" is a term from the 90s and is anything but precise. PATA drives, regardless of generation, are downward compatible in general. There are rare issues which someone more knowledgable on the 1200 might tell you more on.
However, what you might want to check:
- the issues connected with more than 4 GB capacity:
http://www.youngmonkey.ca/nose/articles/NewTekniques_9810/AmigaInMotion.html- jumpers: the drive needs to be set to master; some (rare) don't power up as single slaves without a master present and cable select doesn't work with 1:1 cables.
