# iPhone ProRes “Slow Recording Speed” Error: Fix It Safely
Canonical: https://cloudzat.com/iphone-prores-slow-recording-speed/
Markdown: https://cloudzat.com/iphone-prores-slow-recording-speed/index.md

## Direct answer
Apple requires an external drive that sustains at least 220MB/s for 4K60 ProRes and at least 440MB/s for 4K120 ProRes, with maximum power draw of 4.5W. The drive must be exFAT, password encryption must be off and the cable must support USB 3 at 10Gbps or faster. A hub, unknown cable, heat or a drive that slows after cache can trigger the warning even when the box claims 1,000MB/s or more.

## Replacement decision
For repeated ProRes recording errors, the most useful replacement is a complete connection path that can sustain recording: a suitable SSD, a real data cable and enough power without an unstable chain of adapters.

## Key topics
- Apple’s current external ProRes requirements
- Why a fast SSD can still show “Slow Recording Speed”
- A step-by-step diagnosis
- Special caution for 4K120 ProRes
- Format, partitions and password protection
- Power, heat and accessories
- A reliable recording and offload routine
- When the SSD itself may be the problem
- Replace the part of the ProRes chain that actually fails the requirement
- Choose an iPhone SSD for recording, not just desktop benchmarks
- Use cable and power hardware as deliberate parts of the recording setup
- Reformat and migrate without sacrificing the only copy
- Build a ProRes kit that can survive a cable or SSD failure

Dynamic Amazon prices are intentionally excluded from this context.