macOS · Storage benchmark

iMac19,1

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

237 GBSample count: 1Latest measurement 2023-02-22

Sequential read

268.41MiB/s

Average transfer speed

Sequential write

235.29MiB/s

Average transfer speed

4 KiB random read

27.31MiB/s

6,991 IOPS · Q1T1

4 KiB random write

163.89MiB/s

41,956 IOPS · Q1T1

Every capacity, one place

Results by capacity

Average speed · MiB/s

All recorded capacities for iMac19,1 on macOS
Capacity	Seq. read	Seq. write	4 KiB read	4 KiB write	Sample count	Latest measurement	Compare
237 GB	268.41	235.29	27.31	163.89	1	2023-02-22	Compare →
953 GB	702.76	633.38	39.76	227.70	5	2023-08-17	Compare →
956 GB	1,311.14	648.92	45.01	190.19	1	2022-11-23	Compare →
1907 GB	1,562.79	1,361.72	93.96	333.03	4	2023-05-17	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.