Graphic designer's MacBook Pro was "unusably slow" when working with large Photoshop files. Saving took minutes, Finder would beach ball. User ran Disk Utility First Aid - reported "no problems found." Activity Monitor showed disk I/O maxed out even during simple operations.

Disk Utility's First Aid is a quick check but doesn't catch everything. Needed deeper scan of partition maps, filesystem structures, and SMART data across all volumes.

Comprehensive disk health check that goes deeper than Disk Utility. Scans all mounted disks, verifies partition maps, checks HFS/APFS volumes, and reports SMART status.

Uses diskutil verifyDisk, diskutil verifyVolume, and smartctl to perform read-only checks. No data modification - safe to run on production systems.

Script found filesystem inconsistencies Disk Utility missed. Booted to Recovery Mode, ran First Aid from there (can write repairs when booted from recovery). Errors corrected. Performance returned to normal.

Mac running slow with no obvious cause? We perform deep diagnostics to find issues standard tools miss.