f3write:tldr:b5c6b
The command "f3write --max-write-rate=${kb_per_second} ${path-to-mount_point}" is used to write data to a file system at a specific maximum write rate.
Here is a breakdown of the different parts of the command:
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"f3write": This is the name of the command-line tool that is being invoked. It is part of the F3 (Fight Flash Fraud) project, which is used to test and verify the authenticity and quality of USB flash drives and SD cards.
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"--max-write-rate=${kb_per_second}": This is an option provided by the f3write tool to specify the maximum rate at which data should be written. The variable ${kb_per_second} needs to be replaced with the desired value in kilobytes per second. For example, if you want to limit the write rate to 100 kilobytes per second, you would replace ${kb_per_second} with 100.
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"${path-to-mount_point}": This is the path to the mount point or directory where the file system you want to write to is mounted. The variable ${path-to-mount_point} needs to be replaced with the actual path. For example, if the file system you want to write to is mounted at "/mnt/mydrive", you would replace ${path-to-mount_point} with "/mnt/mydrive".
When you run this command, the f3write tool will start writing data to the specified file system at the maximum rate you have specified, until the file system is full or until you manually stop the command. This can be useful for testing the write performance of storage devices, verifying their claimed capacity, or identifying potential issues.