Macbook Pro i7, Hard Disk space filling up before my eyes (Mavericks) I have 84GB free on my Flash hard disk but in 3 hours it fills up to 0B.
When I restart the 84GB is there again and something starts eating my HDspace again.

With Grand Perspective it does not show where this space went.
In daisydisk it is in hidden space (also with administrator scan)
On About my Mac, the space went to 'Other'.

It is not the Snapshots of Time machine (I turned TM off).

This thread (What is filling up my hard drive so fast?) did not help me out, so I try again.

Thanks
gvb found the application that kept filling up his drive by running:

sudo fs_usage -f filesys

(at my suggestion) in a Terminal. This command allows you to monitor file system usage, such as reads and writes by different processes. 

In his case, "Avid App Man Helper" was filling up the drive continuously. Once this application was removed, his hard drive space was freed and no longer being continuously filled by this process.