I've seen similar questions out there but not the same.
I have a broken Seagate hard drive that I want to return to the store. It has a lot of private data on it. I can't access it through the computer. I can only see it showing as a 'backup' but it is not listed under 'computer' as a drive. So, I don't think I can overwrite the data.
The question then is, how can I destroy the data without erasing through the computer (no access) or without physically destroying it (store wont accept the return)?