Western Digital Drive and Model Suffix (resolved)

[WhoIsThat]

where do i find this "model suffix" thingy on the drive?

In addition to the serial #, the online RMA process is asking for it, but I can't find it on the drive. (No, it's not part of the model number).

Thank you! I really need to get a replacement for the drive quickly..

 

[WhoIsThat]

update: they told me to pick any number and it doesn't matter in my case. it is needed for some models, however.