A Useful Disk Filling Utility

Sometimes you need to fill a disk’s useable space with harmless data files. (For example, to overwrite all your deleted files so that a file recovery program cannot recover your old files. This is a wise thing to do before you donate your old PC to someone.)

Our downloadable text file, Write64TB.dat, when renamed to Write64TB.bat, is a batch file which copies billions of copies of the alphabet to a device until it is full (up to 64 Terabytes).

To avoid problems with Antivirus programs which prohibit download of executable files, we offer it as (click here: )  Write64TB.dat.

After you download it, take a look at it to assure yourself that all it does is create junk text files. Then change the name to Write64TB.bat.

To use it, copy it to the device that is to be filled with data. Then double-click on the name, Write64TB.bat. It will begin immediately. You can watch its progress by opening the sub-folder named junk.

It can take hours for Write64TB to complete when a lot of space it to be filled. When the process finally completes, check the Properties of your device to be sure that it shows 0 bytes available (in most cases) or perhaps it will show about 1K or less space remaining on the drive. This is hard to avoid with a simple utility like this one.

Note that if the disk you are cleaning is the main drive on which Windows is installed, then the Properties display may show a small amount of space still available. This is normal, as Windows will not let itself run completely out of disk space.

When Write64TB is done you can discard the junk folder so the overwritten disk space becomes available again.

Using Write64TB to Diagnose FAKE Memory Cards and Drives

 I was amazed to see a review on Amazon.com of a SANTIN 256GB MicroSD drive which said that the card had to be fake. The review said that they were really 32GB cards, faked to appear to your computer as 256GB when you plug it in to a Card Reader, but really only holding 32GB. The review also said that in fact at this time (late 2015) NOBODY made a 256GB MicroSD card.

So, realizing I had a tool that would easily tell the truth I bought a SANTIN 256GB MicroSD card from Amazon.com for a too-good-to-be-true $15. When it arrived I ran Write64TB to fill the card with many GB of data. When Write64TB had (supposedly) written about 40GB, I checked the content of the card. To my amazement, several of the files that had been written had also been DELETED. The total remaining was just UNDER 32GB. Incredible.

So I called Amazon.com to report this situation. My testimony, added to the previous review which I had seen, was enough to convince them to stop selling this particular item, regardless of what partner vender was offering it.

I only wish Amazon had been aggressive enough to test other suspicious 256GB MicroSD cards and stop selling all of them! I decided I was not going to personally buy one of every suspicious card to test it.

How you can test such cards or drives:

1.       Just download Write64TB as above.

2.       Copy it to the device to be tested.

3.       Double-click on Write64TB.exe to start it.

4.       Open the “Junk” folder and watch the progress of files being written. Or, right click on the device and open its Properties.  

5.       If the device is a faked device with a much lower actual capacity than it is labelled to have then you will see some of the files start disappearing when the actual capacity is reached.

6.       If you find a fake card, please contact the seller and report it.

--Ron Jones, 2017