@ronnie-wong
No problem 
We have to sent the MacBook to get repaired and for security reason we "must" wipe out the disk. When will have the MacBook back i'll have to reinstall.....and we'll see how :-). I never worked with apple product so....but first step i have to wipe out. This Macbook has an SSD
Reading some article an some post on various forum seem not necessary to wipe out an SSD because of how it works and also because doing that we reduce the life of the SSD itself, I saw that there are specific product to securely erase SSD(Blancco and Parted Magic) but they are not free and i don't know if i can build a bootable disk with that product for a Mac.
In this moment i have two choice
- 1): Start MacOS in recovery mode and form diskutil run a normal erase(i don't have the "Security Option" ). I read that the security erase is still place in the command line version of diskutil but i don't know how to do it work. Even from the GUI version i don't undestand how the partitions are configured and what i have to delete:
Using Disk utility form the GUI i saw this:
*/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme 251.0 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_APFS Container disk1 250.8 GB disk0s2
/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +250.8 GB disk1
Physical Store disk0s2
1: APFS Volume Macintosh HD 28.5 GB disk1s1
2: APFS Volume Preboot 18.8 MB disk1s2
3: APFS Volume Recovery 506.6 MB disk1s3
4: APFS Volume VM 1.1 GB disk1s4*
and i don't know how interpret the structure of the partitions, What is Disk0 and Disk1? Disk0 is the physical Disk and Disk 1 is a kind of virtual disk inside Disk0? what i would do to run diskutil secureErase ?
- 2) Boot from a Linux Live Usb and Run this command: for i in $( seq 0 2 ); do dd if=/dev/urandom of=/dev/sda; done or using the command wipe or shred risking to reduce the life of the SSD
Any Advice is welcome 