how to move the attachments from the database to the file system?

[Stefan118]

I would like to move the attachments from the database to the filesystem to increase pageload.

In the ACP I go to:
Attachments
--> Attachment storage type

I have created a new folder called attachments, and gave it the 777 permissions.

In the ACP i have set it like this: /attachments

If i press OK, vB is testing the read/write function and is failing.
"We attempted to write a test file to /attachments, but we were unsuccessful. Please verify that the web server has write/delete permissions for this path."

My forum is installed in the root.
Even if i write down the whole name, including http://www it isnt working.

Please help.