If someone was to create a Turecrypt 20gb standard encrypted file container, and then created a hidden volume within that container of 10gb then could the container's hidden volume be detected by measuring unaccounted for partition space on your drive? Will the standard volume still read as 20gb when mounted or does Truecrypt allocate 10gb of partition for each volume. If the standard volume was mounted using the password then could the hidden volume be detected by writing 20gb of data to the standard encrypted container. Would it say there's not enough space if the hidden volume already contained 5gb of data or does Truecrypt use 30gbs of partition space? I can see hiding a small hidden volume, but can a large hidden volume be detected. I hope this doesn't sound too confusing. I've never used a hidden partition.