I installed a trial version of Acronis 2011 and attempted a backup to my removable 1 TB hd," g:". I got an error message indicating the backup had failed. A couple of minutes later the g: drive disappeared from Explorer. In it's place was "System Reserved f: 100 MB" . The rest of that disk is "Unallocated". Acronis tells me the data on that disk is gone (there can't be any files in unallocated space). I'm seeking a 2nd opinion.