Problem
Premiere Pro media cache grows until the system drive runs out of space during repeated H.264 imports.
Solution
Root Cause / Diagnostic:
Premiere Pro automatically generates .cfa audio peak files and .pek waveform files for every imported H.264/H.265 clip. With high-volume imports or frequent multi-cam shoots, unmanaged cache accumulation rapidly consumes hundreds of gigabytes. If the media cache is located on the primary boot drive, storage fills completely, preventing temporary disk writes and causing system crashes or failed autosaves.
Actionable Fix:
1. Navigate to Preferences -> Media Cache and redirect both 'Media Cache Files' and 'Media Cache Database' to a dedicated high-capacity secondary SSD.
2. Click 'Delete Unused' in Media Cache preferences, or manually delete the contents of the Common/Media Cache Files directory while Premiere is closed.
3. Set cache management rules to automatically delete cache files older than 30 days or when total cache exceeds 100 GB.
Pro Tip:
Schedule a weekly script to purge orphan .cfa and .pek files from inactive project directories to maintain pristine NVMe read/write performance.
Premiere Pro automatically generates .cfa audio peak files and .pek waveform files for every imported H.264/H.265 clip. With high-volume imports or frequent multi-cam shoots, unmanaged cache accumulation rapidly consumes hundreds of gigabytes. If the media cache is located on the primary boot drive, storage fills completely, preventing temporary disk writes and causing system crashes or failed autosaves.
Actionable Fix:
1. Navigate to Preferences -> Media Cache and redirect both 'Media Cache Files' and 'Media Cache Database' to a dedicated high-capacity secondary SSD.
2. Click 'Delete Unused' in Media Cache preferences, or manually delete the contents of the Common/Media Cache Files directory while Premiere is closed.
3. Set cache management rules to automatically delete cache files older than 30 days or when total cache exceeds 100 GB.
Pro Tip:
Schedule a weekly script to purge orphan .cfa and .pek files from inactive project directories to maintain pristine NVMe read/write performance.