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Reply To: [Solved] iPhone 15 Pro Max 1TB ProRes Log 4K 120fps Video Recording Dropping Frames (iOS 18.1) – Verified Troubleshooting

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Home › Forums › iPhone & iOS Help Desk › [Solved] iPhone 15 Pro Max 1TB ProRes Log 4K 120fps Video Recording Dropping Frames (iOS 18.1) – Verified Troubleshooting › Reply To: [Solved] iPhone 15 Pro Max 1TB ProRes Log 4K 120fps Video Recording Dropping Frames (iOS 18.1) – Verified Troubleshooting

November 14, 2026 at 4:58 pm #8515
Alex Tanner
Lead Moderator
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 Certified Support Professional (ACSP)
Cupertino, CA | "Precision Apple Diagnostics"