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Thanks for the response Diego,
I have since reformatted the drive using windows and that returned the full memory capacity.
Prior to this I did the del * in windows, and also activated 'show hidden files", and it showed no files but only the 188MB free space. I used windows to do a disk check before the reformat and it found the files and recovered them but I did not look a them any further before reformatting.
When I was in Linux before the reformat and did the $ rm -rf * and $ rm -rf \.* and then did $ ls -a, it only showed the '.' and '..' directories and still only 188Mb free.
I think what happened is that while I was loading the image onto the Edison in file transfer mode with Linux, there was not enough power to run the Edison from the USB hub and it reset in the middle of the process and this created the un-see-able file fragments. I am now running on external power.
Thanks again for your response