You can find all of the code details on GitHub here⇗. Everything is open source, so you are welcome to try it out or modify it.
This is a computer application I made in Java: It creates a *.test file of the user’s desired size. A use for this is testing a new flash drive or hard drive to check the read and write speeds on it. If you need an exact file size for any reason, with this you can do just that.
This program implements multi-threading so that you can watch the progress happening as the file is being written to disk. At some point I want to optimize it further so that it can write multiple files at once and combine them to save time.
What’s a *.test file?
Essentially, it’s a text file. I made up the file extension so you can find and delete them with a quick file search. What is contained in these files are just random integers. Each integer represents 1 byte of information, so if you specify a file of exactly 512 bytes, there will be 512 random integers. You can open these files with notepad.exe or similar, however it is not recommended for really large files because it won’t be able to store all of that into memory. Here is an example of a *.test file in notepad.exe.
I utilized the Java swing library and file chooser to make the GUI for it. This application has been tested on Windows and Linux, however it should run on Mac too if you have a recent version of Java installed on your PC. This application supports multi-threading to update the progress bar as the file is being written to disk. I made this project for fun, and thus it has no warranty. Use at your own risk. I would appreciate any feedback that you give.
How to Launch:
Disclaimer: Open files at your own risk. This program will not tamper with any of your files or execute any files without your knowledge. It utilizes the Java filechooser library so you can specify where you want to save the *.test file. It will not do anything that you do not tell it to do. However, this program does not contain any warranty, and it is not liable for unintentional damages to your system. I recommend you review the code and use a sandbox to test it out and make judgments about it for yourself.
Navigate to my GitHub page⇗ and open the .jar file to run the application. It is portable, so no need for installation. (If you do not know how to execute a .jar file, maybe look here to start. https://www.wikihow.com/Run-a-.Jar-Java-File)
The main window has a text field where you can enter how big you want the file to be. Choose from the drop-down menu what unit of file size you need and click save. Choose a file location and a name for your file. (Don’t worry about adding an extension.) A loading bar will appear on screen to show you the current progress, and a message pop-up will show when the file is done.
I’m not sure what the limit is on making big files, but I capped it to be a maximum of 64GB which is reasonable enough. I don’t know why you’d need that big of a file anyways.