tech tool pro not supported

Techtool Pro used to be part of Apple Care.... I have been using that product since TT Pro 6. When Apple decided to change to APFS Techtool Pro 12 stopped working on File Optimization and Volume Optimization. Here is the last word from TechTool regrading this issue.... I think there are many Apple users that are in the same boat.... we would like an answer, if Apple has one, or anyone else... thanks.

APFS support status

It is understandable to conclude that Mojave, or Catalina support and APFS support would mean the same thing. However, the operating system and the file system are, in fact, distinct from one another. While the operating system serves as the 'window' for interacting with drives in many ways, there is no API for dealing with the disk directly.


The current documentation from Apple does not include sufficient information to write a tool to defragment APFS volumes. The extent of the documentation on the subject so far is a feature flag labeled NX_FEATURE_DEFRAG which indicates whether an APFS container supports defragmentation.


If Apple releases additional documentation that provides sufficient information for manipulating the data directly on disk, we will explore whether a defragmentation feature is feasible for *rotational* APFS drives. Defragmentation on Solid State Drives in the traditional sense will not be supported, as organizing data on solid state devices only serves to increase wear, and provides no performance benefit.

Likewise, while the Volume Rebuild can repair many drives with volume structures problems, a full rebuild that reorganizes the volume structures can only be implemented once Apple provides further documentation.

It is important to note as well that Techtool Pro uses a low-level API to test, repair, rebuild, and defragment Mac OS Extended volumes. No such API yet exists for APFS, and it is unclear if Apple will make one available.


MacBook Pro 13″, macOS 10.15

Posted on Oct 23, 2020 1:55 PM

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Oct 24, 2020 7:28 PM in response to Michael Driskill

You don’t need to delete it. Just be cautious about taking any action because of it. You Mac does not need any maintenance. At least, it didn’t the first time you turned it on. There is a lot of misinformation out there. I am not saying that Tech Tool Pro is guilty of spreading any misinformation. In some cases, no amount of documentation can overcome customer misunderstanding.


For example, the main thing I’m thinking about here is temperature. There are a lot of utilities that feed an obsession over temperature. Sometimes they will let you control the fans. Sometimes the misinformation is on social media and convinces people they need to disassemble their computer and reapply thermal paste.


The misinformation can be overwhelming sometimes.

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tech tool pro not supported

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