iOS · Storage benchmark

iPhone 11 Pro(iPhone12,3)

Sequential and 4 KiB random read/write performance, measured with Jazz Disk Bench.

256 GBSample count: 124Latest measurement 2026-01-30

Sequential read

744.58MiB/s

Average transfer speed

Sequential write

514.46MiB/s

Average transfer speed

4 KiB random read

22.14MiB/s

5,668 IOPS · Q1T1

4 KiB random write

16.71MiB/s

4,277 IOPS · Q1T1

Every capacity, one place

Results by capacity

Average speed · MiB/s

All recorded capacities for iPhone 11 Pro(iPhone12,3) on iOS
Capacity	Seq. read	Seq. write	4 KiB read	4 KiB write	Sample count	Latest measurement	Compare
64 GB	586.31	208.60	21.77	11.72	162	2026-07-07	Compare →
256 GB	744.58	514.46	22.14	16.71	124	2026-01-30	Compare →
512 GB	727.27	553.53	21.22	16.13	47	2026-09-16	Compare →

Measurement details

Data source: Imported aggregate
Recorded workload version: Not recorded in the original aggregate
Grouping: Model, capacity and platform
Sample count: Number of recorded test runs, not unique devices

How results are aggregated

Results checked 2026-09-23 · Speeds in MiB/s · About these measurements

Reading these results

These are average measured speeds for the selected Model, capacity and platform. Sequential tests describe large-file transfers; random Q1T1 tests describe small-block operations. Storage capacity, free space, temperature and background activity can affect results.

Compare individual read and write measurements to match your workload. Read the test methodology or learn why results vary.