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Models with the most samples
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Storage performance
Sequential read
MiB/s · higher is fasterB is 0.19% higher than A
Sequential write
MiB/s · higher is fasterB is 13.61% lower than A
4 KiB random read
MiB/s · higher is fasterB is 73.09% higher than A
4 KiB random write
MiB/s · higher is fasterB is 11.92% higher than A
Configuration details
| Detail | A · samsung SM-X820 · 256 GB | B · samsung SM-F9660 · 512 GB |
|---|---|---|
| Platform | Android | Android |
| Sample count | 9 | 1 |
| Latest measurement | 2026-03-25 | 2025-10-17 |
| Random read IOPS | 12,931 | 22,383 |
| Random write IOPS | 20,054 | 22,444 |
| 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.