So far other than what Apple supplies within Disk Utility there is no 3rd party tool to fix APFS volumes or low level corruption.
The only way is to nuke the drive fully and then reformatting it. Even that only goes so far as there are boot block elements which can become over worn requiring a new SSD.
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Using a bootable external drive which I've also installed the OS installer app and [https://binaryfruit.com/drivedx|DX Drive] to see how worn the SSD is as far as I go in checking it. Reformat the drive using the external drive as your boot drive so there is nothing holding your internal drive open. I even go as far as formatting it GUID and a journaled file system (now called Mac Extended) which is the older HFS+ structure and then check it out using some drive testing apps.
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Using a bootable external drive (macOS Sierra 10.12) which I've also installed the OS installer app and [link|https://binaryfruit.com/drivedx|DX Drive] to see how worn the SSD is as far as I go in checking it.
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Reformat the drive using the external drive as your boot drive so there is nothing holding your internal drive open. I even go as far as formatting it GUID and a journaled file system (now called Mac Extended) which is the older HFS+ structure and then check it out using some drive testing apps.
But be careful! The testing apps will write and rewrite data on the drive each time stealing a bit of life from the SSD.
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Then run the the OS installer, I start with macOS Mojave (10.14.6) on the Intel systems, then upgrade to what the customer wants.
So far other than what Apple supplies within Disk Utility there is no 3rd party tool to fix APFS volumes or low level corruption.
The only way is to nuke the drive fully and then reformatting it. Even that only goes so far as there are boot block elements which can become over worn requiring a new SSD.
Using a bootable external drive which I've also installed the OS installer app and [https://binaryfruit.com/drivedx|DX Drive] to see how worn the SSD is as far as I go in checking it. Reformat the drive using the external drive as your boot drive so there is nothing holding your internal drive open. I even go as far as formatting it GUID and a journaled file system (now called Mac Extended) which is the older HFS+ structure and then check it out using some drive testing apps.
But be careful! The testing apps will write and rewrite data on the drive each time stealing a bit of life from the SSD.