f3 software package provides test real flash memory capacity, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install f3
f3 is installed in your system.
Make ensure the f3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep f3 *
You will get with f3 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | f3 |
| Version | 6.0-2 |
| Description | test real flash memory capacity |
| Sub Section | Utils |
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