If errors are found, they can be repaired usin the Partition Repair tool.
Partition map errors can cause entire volumes to go missing, or prevent a Mac from booting.
The new Partition Map test checks the partition map of a given drive for errors. It is important also to test the data structures that contain the Mac's file system: the Partition Map.
Partition Map - TechTool Pro has long been known for testing your Mac's file system. Using the new configuration panel, you have total control of the Check Computer suite. Sometimes, though, it's nice to be able to leave tests out, or to skip certain drives. Check Computer - Check Computer is a handy way to tell TechTool Pro to run the entire suite of tests to give you the best possible snapshot of your Mac's health. All of that, wrapped in an entirely new interface. It also includes the same improvements to the SMART check in TechTool Pro. New features include check for I/O errors, Power On Self-Test errors, Mac notebook internal battery condition, and RAID status (if applicable). TechTool Protection - TechTool Pro includes the option of installing a system preference pane to keep watch over your Mac. With the release of this version, it has become more proficient than ever. 
TechTool Pro has long been one of the foremost utilities for keeping your Mac running smoothly and efficiently.
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