求救！ ghost 出现问题 ：“Cannot lock the volume(1959)”

shenyuanhao

ghost 备份分区时 到最后一步选择压缩方式后出现“Cannot lock the volume(1959) ” 提示！
全文：“A source volume could not be locked as if is in use by anther process.Do you wish to attempt to forse a dismont on the volume or to use Volume Snapshot? If you choose 'forse a Discount'then ALL OPEN FILES ON THIS VOLUME WOULD THEN BE INVALID"
下面有三个可以点击的选项  1.Force lock     2.Volume Snapshot     3.Cancle
请问这是什么意思？咋办捏 ！