If I Delete A File Uploaded To Dropbox From My Hard Disk Will It Be Deleted From Dropbox Too

I would also need some clarification of the point mentioned by Matt Smith on his “Using the Magic Pocket: A Dropbox Guide” under the system requirements that Hard disk space should be at least equal to Dropbox storage limit. Does it mean that I must have 2 GB free space on my hard disk as soon as I signed up to Dropbox? What will happen if my hard disk have less free space than the storage limit available to my Dropbox account?

I reckon you have got my point of concern. I will be happy to hear your opinion.