How to slow down your file copies

2010-10-19 22:49:00

While preparing for a course I will be teaching in two weeks time I need to set up some virtual machines for the practice labs. All of these run on Sun's VirtualBox and FoxT has provided me with a USB disk filled with the appropriate disk images. I bought two extra USB drives, so we could set up the student's computers faster (three drives instead of one to pass around the files). 

But that's where the crap starts. You see, if I'm not mistaken all the students will use Windows boxen. I have a Mac. All the virtual machine disk images are big, between 10GB and 22GB. 

Now, the only file system that is 100% read+write out of the box between Windows and Mac OS X is the aged FAT32. And no, FAT32 does not support any files over 4GB in size. Crap :(

This means that:

  1. I have formatted my extra USB drives as NTFS, using Windows XP running in a Parallels virtual machine.
  2. I have installed MacFUSE and NTFS-3G on my Mac, to enable it to write to NTFS.
  3. I am now copying 200GB of disk images from one USB drive to the other.

Because USB is CPU-bound and because the NTFS-3G driver is experimental this ordeal constantly takes up 27% of my 200% CPU time (dual core) and the actual copy will take roughly four hours. Damn!

I think I'll quit the copy and be more selective about the disk images that I copy. :) tags: , , ,

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