ST2000LM007 Platter Scratch

[Hddex]

As you can see from the photo there is scratch on the top platter , I checked the second platter and it looks clean. How I have a donor drive. What is the best way to avoid the replacement head getting damaged when reading the top platter ?

[SGdata]

This scratch is before the ramp end so i wouldn't worry that much. But the platter looks dirty.

[northwind]

Now, here's a question:
If it is before the ramp, how was the ring created in the first place?
(there is easy answer)

[SGdata]

Bent heads that didn't make it to park right or broken ramp.