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@AltraMayor - that'd explain the insane read speed, but - I've tested tens of thousands of drives at this point and I never saw something like this happen before. And...

Oh. I think you're right. This would cause a fake drive with a cache being able to pass the test. Though I don' think I have encountered fake drives here...

Write logs: [A_01_2018-12-18_13:36:39.log](https://github.com/AltraMayor/f3/files/2690637/A_01_2018-12-18_13.36.39.log) [A_02_2018-12-18_13:36:39.log](https://github.com/AltraMayor/f3/files/2690638/A_02_2018-12-18_13.36.39.log) [A_03_2018-12-18_13:36:39.log](https://github.com/AltraMayor/f3/files/2690639/A_03_2018-12-18_13.36.39.log) Read logs: [C_01_2018-12-18_14:28:15.log](https://github.com/AltraMayor/f3/files/2690642/C_01_2018-12-18_14.28.15.log) [C_02_2018-12-18_14:28:15.log](https://github.com/AltraMayor/f3/files/2690643/C_02_2018-12-18_14.28.15.log) [C_03_2018-12-18_14:28:15.log](https://github.com/AltraMayor/f3/files/2690644/C_03_2018-12-18_14.28.15.log) They all passed the tests 100% (no errors) - but the read speeds do not exceed 15 MB/s this time...

@AltraMayor - that'd explain the insane read speed, but - I've tested tens of thousands of drives at this point and I never saw something like this happen before. And...

@AltraMayor - I'm not sure if the 1st tested drive is really fake, because I've already tested it with f3write/f3read and I don't remember any of the drives returning 32...

Could you give more details about what went wrong?

> There's a Chinese made utility called [ChipGenius](https://www.mydigit.cn/forum.php?mod=viewthread&tid=209287) that is able to detect the controller chip and the NAND chip of a pen drive(assumingly via proprietary protocols), we should really...

`man f3brew` says: ``` -s, --reset-type=TYPE Reset method to use during the probe. ``` What is this option? What are possible values for TYPE? Will this reset the USB device...

A few years ago I've written a Bash CLI interface to test multiple drives in parallel using f3 with progress indicators, read and write speeds all taken from Linux system...

@AltraMayor - isn't f3read and f3write using syncronised I/O to avoid using OS disk cache? Or is it something different?