Quickly create large files for testing

I_D

Member
Aug 3, 2017
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Hope you guys don't mind me posting a guide I found -> here

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:
Code:
fsutil file createnew <file> <size in bytes>
For example, this command will create a 1GB file called 1gb.test on my desktop:
Code:
fsutil file createnew c:\users\steve\desktop\1gb.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

source
 
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jfeldt

Member
Jul 19, 2015
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Nice, thanks! In the past, I've always resorted to using dd on a unix system then transferring the files to a Windows system, this saves some time for cases when you don't care what the file is composed of.
 

jfeldt

Member
Jul 19, 2015
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Since a 1GB file is created essentially instantly, I figured it was empty, and when I use default 7-zip parameters, a 1GB file zips down to ~1.1MB, so yep.