Quickly Generate Large Test Files in Windows


Never download another 100mb test file or waste time searching for a large file.  Sometimes you need a large file fast to test data transfers or disk performance. Windows includes a utility that allows you to quickly generate a file of any size instantly.
Open an administrative level command prompt.

Run the following command:

fsutil file createnew <file> <size in bytes>


For example, this command will create a 1GB file called 1gb.test on my desktop:

fsutil file create new c:usersstevedesktop1gb.test 1073741824

The key is to input the size of the file in bytes so here are some common file sizes to save you from math:
1 MB  1048576 bytes
100 MB  104857600 bytes
1 GB  1073741824 bytes
10 GB  10737418240 bytes
100 GB  = 107374182400 bytes
1 TB  1099511627776 bytes
10 TB  = 10995116277760 bytes

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