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MrMister111

macrumors 68040
Original poster
Jan 28, 2009
3,368
270
UK
On an old iMac (late 2012), I’ve booted using CMD-R and in disk utility I’ve chose to erase.

However there isn’t an option for secure erase like the last time I did it years and years ago. Has this changed now?

The drive is a Fusion drive 1.12Tb, I think it’s the older type with a 128Gb SSD and 1Tb HDD.

Thanks
 

Fishrrman

macrumors Core
Feb 20, 2009
22,640
8,518
Seems to me that you would have to "DE-fuse" the fusion drive first.
Then, with the SSD and HDD portions "split apart", you can work on each individually.
Disk Utility -might- let you do a secure erase on the HDD, but I'm thinking that it WILL NOT do this on the SSD portion.

Having said that, you might use something like Drive Genius to do this:
1. Erase (not "secure") the SSD
2. Now all the space is "free" (i.e., no files on the drive)
3. Next, use Drive Genius "erase free space" option to write 1's and 0's to the "free" space.
4. Done.

Another way to do it (with the drives still "fused"):
1. Erase the fusion drive (not "secure") with disk utility
2. Encrypt the drive with filevault.
3. Now, erase it AGAIN with disk utility.
4. ANYTHING that might have been on the drive will now be unrecoverable.
 

MrMister111

macrumors 68040
Original poster
Jan 28, 2009
3,368
270
UK
Thanks.

Doesn’t seem to be any secure wipe options in disk utility in the CMD-R reboot.

I don’t really want to de-fuse as you say as it’s being passed on I believe.

So is it ok to just do an erase and wipe and couple of times and then reinstall the MacOS? Is this safe, for data wiping?

Is this what others have done? Must have been done a few times now with people passing these on and/or selling?

Thanks
 
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