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Storage performance
Sequential read
MiB/s · higher is fasterB is 0.16% lower than A
Sequential write
MiB/s · higher is fasterB is 85.46% higher than A
4 KiB random read
MiB/s · higher is fasterB is 24.85% lower than A
4 KiB random write
MiB/s · higher is fasterB is 157.88% higher than A
Configuration details
| Detail | A · samsung SM-S921B · 256 GB | B · WDC PC SN530 SDBPNPZ-512G · 476 GB |
|---|---|---|
| Platform | Android | Windows |
| Sample count | 8 | 1 |
| Latest measurement | 2026-10-19 | 2023-08-11 |
| Random read IOPS | 16,733 | 12,574 |
| Random write IOPS | 16,395 | 42,281 |
| 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.