Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have an ext4 drive which is available to my windows XP VirtualBox as a shared folder. When working with files across ubuntu and windows I sometimes see these autogenerated files with Zone.Identifier:$DATA appended to the name. For example, if I have the file


Then I will get a small annoying file like


The contents of the file:


They seem to be created any time I write a file to the ext4 drive from within my windows virtual machine. I seem to be able to safely delete them without any obvious consequences.

What are these files for, and if they're useless how can I prevent them from being generated in the first place?

share|improve this question
up vote 6 down vote accepted

I found the place to disable them, at least in WinXP. Run gpedit.msc and then configure as below:

enter image description here

share|improve this answer
Nice one - thanks for sharing the solution. I didn't have the "Attachment Manager" entry, but found elsewhere that it could be added by right-click on "Administrative Templates", choose "Add/Remove templates", and add the "system.adm" template. After that I was able to enable the "Do not preserve zone info..." option. – Steinar Mar 30 '13 at 13:54

That file is for storing an NTFS Alternate Data Stream - it's a feature that basically allows any file to have a number of hidden files inside it.

I think that particular stream is written when you download something from the net - Windows can then display that nice "Security Warning" dialog box when you run it and offer to show you an EXEs digital certificate for example. Going to Properties and clicking Unblock may remove this, and there might be a setting to disable it somewhere in Windows.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.