Originally Posted By: tacit
Use Disk Utility to verify your hard drive and run a surface scan.
Disk Utility cannot run a surface scan. TechTool Pro can, and also (I believe) Drive Genius. Did you mean to make the surface scan suggestion separate from the verify advice?

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365