Excuse me, When I wiped a HDD and all data are overwritten then how "HPA and DCO" can recover all of my data? How about their sizes?
This is why I said simply "No" as the rest just sends you down a rabbit hole.
First of all you likely don't have HPA/DCO to deal with. Even if you did, the only thing there is what was explicitly placed there via a custom process. If it was your custom process then you obviously already know what that is. Your regular disk activities don't touch
HPA/DCO, so none of your data is there to recover.
Excuse me, When I wiped a HDD and all data are overwritten then how "HPA and DCO" can recover all of my data? How about their sizes?
When you wiped a HDD and all data in the accessible areas of that HDD are overwritten, nothing touched *whatever* is (or may be) in either the HPA or DCO areas (if any) that by definition are reserved, inaccessible areas of your HDD.
It is not that difficult, both the HPA and the DCO are reserved, normally inaccessible areas of your hard disk.
dd or any other wiping software won't ever access them.
The only way to wipe those areas (which I repeat you never wrote anything to and surely never anything "personal", "compromising" or "meaningful") is either
1) to remove their "protection" (thus making those areas accessible) and then wipe them
2) use the built-in secure erase ATA function that in most (but not all) cases will wipe even the HPA and DCO areas
I gave you a couple links to READ about the matter, please take your time following and reading what has ALREADY been written (and that BTW you could have easily found yourself, had you searched the board).
And now - for no apparent reason roll - I will throw the "g-list" and "p-list" topics on the table (and those are actually rabbit holes, and really deep ones 😯 ).
jaclaz