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Storage performance
Sequential read
MiB/s · higher is fasterSame measured average
Sequential write
MiB/s · higher is fasterB is 26.22% lower than A
4 KiB random read
MiB/s · higher is fasterB is 15.79% lower than A
4 KiB random write
MiB/s · higher is fasterB is 13.97% lower than A
Configuration details
| Detail | A · iPhone18,4(iPhone18,4) · 512 GB | B · iPad Pro (12.9-inch) (5th generation) Wi-Fi(iPad13,8) · 512 GB |
|---|---|---|
| Platform | iOS | iOS |
| Sample count | 68 | 187 |
| Latest measurement | 2026-09-18 | 2026-06-09 |
| Random read IOPS | 14,395 | 12,122 |
| Random write IOPS | 10,721 | 9,223 |
| All capacities | View Model → | View Model → |
Results checked · Speeds in MiB/s · About these measurements
Four tests. A clearer comparison.
Compare sequential and 4 KiB random read/write speeds side by side. Every option includes its Model, capacity and platform. You can compare 512 GB with 256 GB, including two capacities of the same Model.