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Storage performance
Sequential read
MiB/s · higher is fasterB is 0.19% lower than A
Sequential write
MiB/s · higher is fasterB is 15.76% higher than A
4 KiB random read
MiB/s · higher is fasterB is 42.23% lower than A
4 KiB random write
MiB/s · higher is fasterB is 10.65% lower than A
Configuration details
| Detail | A · samsung SM-F9660 · 512 GB | B · samsung SM-X820 · 256 GB |
|---|---|---|
| Platform | Android | Android |
| Sample count | 1 | 9 |
| Latest measurement | 2025-10-17 | 2026-03-25 |
| Random read IOPS | 22,383 | 12,931 |
| Random write IOPS | 22,444 | 20,054 |
| 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.