WDC WD40NDZM-59A8KS1 Module 02

[Mike - USBRecovery.co.uk]

Can someone explain to me like Im a 5 year old, how only the first 512 of a both copies of module 02 can be completely damaged and unreadable. 

Perhaps I'm misunderstanding the process flow but isn't the point of have 2 copies to prevent exactly this ?

[t...@desertdatarecovery.com]

I don’t know. Probably the most corrupt mod I see on SMR drives apart from 190. At least it can be replaced with a donor.

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[Artem Rubtsov]

It's related to glitching PCB, usually some debug modules are damaged (2D,2E,12D,12E) in addition to 02, sometimes 190 is damaged. More often than not it's a USB-C PCB. Sometimes CPU is damaged. 

[Mike - USBRecovery.co.uk]

That must be a very specific kind of glitch for both copies to get damaged in the same manner. You're right though, it's a mac USB-C 810033 only one copy of 190 is damaged but both copies of 21,24 and 12E .

It's another "it just stopped working" drive so you know the client is going to ask how it happened and what they can do to prevent it from happening again.