im in CMD + R and i want to secure erase my hard drive. But blast this new Disk Utility in El Captain.
I want to secure erase the ssd and then reinstall OSX for the next owner.
I have a hypothetical question -- I've never tried this, and it might not work anyway, but...
Let's use a 240gb SSD for an example.
Suppose I have a 240gb SSD with data on it.
I'd like to overwrite that data so as not to be recoverable.
What if -- one took ANOTHER, NEVER-USED 240gb SSD, also of 240gb size,
then
Initialized it for the first time, but put NO data onto it,
then
Used a cloning app (such as CarbonCopyCloner or SuperDuper) to clone the contents of the "new-but-empty" SSD to the old SSD (with data on it).
What would be the result?
You can still customize the system yourself.To clarify: I understand the constraining of Finder to suit an Apple ecosystem that assumes no customer use of hard disk drives. – I understand things to be that way, but I don't like it.
free to change it.
its more easier and more secure to just use filevault and then do a regular erase + reset pram
Opportunistic encryption prior to sale does not work for the same reason that overwriting with random data does not: the SSD may still have pages with data in the ‘over-provisional’ part that it uses for garbage collection.
I don't agree this is accurate. You are correct a FV encryption would not get the data in the over provisioned area, but that is a very small portion of the drive. Between that and the way data is stored on a SSD to begin with, any data retrieval is going to be very very difficult and even then only likely partial recovery. I agree a FV encryption then wipe is not perfect, but I would not say it does not work.
This is a contradiction. You cannot get around the fact that data may still be there. Some SSDs reserve about 10% of their storage cells for this purpose.