[OT] Creating large files for testing purposes

[robinsiebler]

I need a tool to create large files for testing. Basically, I want to crate a file that will take up all of the free space except for specified amount. In other words, I want to be able to say, create a file that will fill up my hard drive but leave X amount free.

There used to be tools like this around, but now that I need one, of course I can't find one.

[Sosna]

well, this big files are called DUMMY files, look for Dummy files creator, something like this: http://www.mynikko.com/dummy/

[Flint]

robinsiebler
If you are working in WinXP and are not against some use of Calculator, you can count the necessary size in it, and then use
fsutil file createnew file_name file_size
(fsutil is a standard tool that comes with WinXP).

[majkinetor !]

U have simple console calcualtor that you can use along with fsutil to create batch file for this.

See SET /A command

/A = arithmetic


To get free disk space parse dir output, to get last line

dir windows* | more +7

this called in C will show you one line (if you have windows folder)

• 1 Dir(s) 45.711.081.472 bytes free

You can then use for command to get only the number of free bytes that you can then multiply with some procentage to get desired file size to feed into fsutil

Code: Select all

for /F "tokens=3" %i in ("               1 Dir(s)  45.711.081.472 bytes free") do echo %i

This will output : 45.711.081.472

Don't forget to remove dots

Maybe its easier to use freedisk command from WIn Resource Kit...

[robinsiebler]

Thanks!

I want to do the same for RAM. I managed to find 2 options, 1 free, 1 relatively cheap:

Low Memory Tester 2.33 ($10)
Memory Allocation Tool

[majkinetor !]

Well, you could use one of those RAM Disks maybe, if it alocates memory dynamicaly.

If not, then I am afraid you will have to write some code..... or use that relatively free app from codeproject