Just did some testing on old and new USB flash drives. All drives were freshly formatted as exFAT to ensure maximum transfer speeds. I only did write tests and caching was turned off. I will update with more flash drives as I get them. The test is writing a single 4.21GB file.
| Flash drive | total time | MB/s |
type |
| ADATA S102 32GB (old) | 00:02:22 | 29.7 | USB3 |
| ADATA S102 32GB (new) | 00:03:37 | 19.4 | USB3 |
| ADATA S102 128GB (new) | 00:01:39 | 45.5 | USB3 |
| ADATA UV128 128GB (new) | 00:05:14 | 13.4 | USB3 |
| Kingston DTSE9G2 64GB (old) | 00:04:39 | 15.1 | USB3 |
| Patriot Xporter Rage XT 16GB (old) | 00:03:58 | 17.7 | USB2 |
Comments
The old ADATA S102 32GB drive writes at a steady 29.7 MB/s. All the new ADATA drives write with large swings in write speed and results in a slower write; maybe to make the drive more reliable? However, my old S102 has been used extensively and has remained reliable.
The Kingston drive also writes at a steady rate but it is pretty slow. It has been very reliable.
USB3 may provide faster reads, but the write speed don't exceed USB2 limits except for the ADATA S102 128GB drive.
Most manufacturers don't seem to publish write speeds. ADATA does and the tests don't come close to except for my old S102 32GB and the new S102 128GB. I don't recommend the ADATA UV128 128GB as that is slower than my Patriot USB2 drive.
The Kingston DTSE9G2 is not fast, but it is convenient being cap-less and having a nice key ring hole.
Update - 2021-02-06
Kingston DT101 G3 16GB USB3 (old) - 5.9 MB/s
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