I took a look at the downvoted questions and well, I can't blame Tim Post's keys this time.
This one is unclear about what you're asking. How does one "download a partition" and download speeds may be dependant on the other side too.
This one is a bit of a mess too. Asking questions as a stream of consciousness does that. I suppose it is also semi-trivial to test.
This one is too broad - especially when we don't know how the VM is set up or what you're doing with it.
This one... lacks any information that's useful in solving your problem.
This one is like asking how long a piece of string is - it depends on partion size, the tool used, the drive speed, plausibly the phase of the moon...
While the question you asked is "why?" the answer you need is "what do I do"
We have a template for mod messaging folks for poor quality questions - I'm reproducing it in part here for your benefit
Specifically, many of your questions were downvoted and closed because they seemed to be hastily written, or of the type that we'd prefer users refrain from asking. This is a troubling pattern; we'd like to make sure that you've read the help that we have available for asking questions. Please take some time to read all of the information linked below prior to asking another question:
Less text speak, and more time formulating your questions would be nice. Ask yourself "If someone called me up and offered me money if I fixed their computer, what would I ask them?" and include these things in your question.
So, yeah, that's why you got downvoted.