Sony FX3 Memory Card Slots: Complete 2026 Guide

The Sony FX3's dual memory card slots revolutionize cinema-grade filming. Supporting CFexpress Type A and SD cards, they enable uninterrupted 4K/120p recording in 2026. This step-by-step guide covers slot specs, best cards, setup, and troubleshooting for pro videographers.

Understanding Slot 1 and Slot 2

Slot 1 prioritizes speed; Slot 2 for backups.
  • 1: CFexpress Type A/SD UHS-II.
  • 2: Dual SD UHS-II.
  • Relay/backup modes.

Step 1: Choosing Compatible Cards

Match your workflow.
  • 1
  • CFexpress: SanDisk 800GB Extreme Pro.
  • SD: Sony Tough G Series 128GB.
  • Budget: Lexar Gold.

Step 2: Formatting Cards

Prep for FX3.
  • 1
  • Menu > Media > Format.
  • Select slot, confirm.
  • Eject safely.

Step 3: Recording Settings

Maximize slots.
  • 1
  • Relay: Seamless overflow.
  • Simul: Dual recording.
  • Slow-mo proxies on SD.

Step 4: High-Speed Workflow

For 2026 pro shoots.
  • 1
  • 4K 120p on CFexpress.
  • Cache clear intervals.
  • Firmware update v3.0.

Troubleshooting Slot Issues

Fix common glitches.
  • 1
  • Error 61: Clean contacts.
  • Overheat: Ventilation.
  • Slow writes: Genuine cards only.

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