I have the white 1TB single disk MBWE. I am preparing to Ebay it and started investigating ways to secure erase it. At first I thought about ssh and zero-ing out the /dev/md2 device where the shares are with dd. I would do the factory restore after that anyway (hope the process won't break the factory restore option).
On few websites/forms it seems to say that the factory restore does delete all data, but I'm not 100% sure what they mean by that. People also say the Delete button deletes files which we know is not true, it only deletes the reference in the table.
So, I would prefer using the factory restore option directly as soon as that really deletes all the data so that even by scanning the disk you can't get the data easily. I don't think the buyer would through that but I want to cover my bases at least against basic data recovery programs.
So, is the factory restore really enough? Since it run mdadm array I guess it could be, because this is not the same as deleting a partition which you can later scan and recover. Destroying and recreating mdadm array usually destroys the data.
I would appreciate some opinions and have in mind that we are talking about secure erase, not just not seeing the files but beeing able to scan and recover them. Thanks in advance.