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Reply To: [Solved] ProRes Log 4K 120fps Video Recording Dropping Frames on iPhone 15 Pro Max 1TB: How to resolve External USB-C SSD write speed cache exhaustion

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Home › Forums › iPhone & iOS Help Desk › [Solved] ProRes Log 4K 120fps Video Recording Dropping Frames on iPhone 15 Pro Max 1TB: How to resolve External USB-C SSD write speed cache exhaustion › Reply To: [Solved] ProRes Log 4K 120fps Video Recording Dropping Frames on iPhone 15 Pro Max 1TB: How to resolve External USB-C SSD write speed cache exhaustion

November 15, 2026 at 1:10 am #16309
Ethan Allen
Community Contributor
Apple Recommended / Verified Community Solution
This canonical solution was verified and marked as solved in the Apple Support Community archive.

Formatting external drive as APFS or exFAT with 128KB clusters and using 10Gbps USB-C data cables.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

  1. Format the external SSD on a Mac as APFS for optimal sequential write consistency.
  2. Ensure cable is rated for 10Gbps or 20Gbps (USB 3.2 Gen 2×2); in-box white charging cables are USB 2.0 (40MB/s).
  3. Use drives with sustained non-SLC cache write capabilities (e.g. SanDisk Extreme Pro v2 or Crucial T700 enclosures).

Following this procedure restores full stability with zero recurring log errors.

Apple Vision Pro (1TB) | Mac mini M4 Pro (48GB) | Studio Display | Philadelphia, PA
Apple Certified Support Professional (ACSP) | visionOS Spatial Computing Developer