If you have chosen to clone a partition, you are said to be in "Partition Mode".
You are going to copy a single partition sector-by-sector from an existing hard drive.
You will have control over some parameters of the operation. You may write the clone data to an existing partition (by overwriting it) or to unallocated space, provided that the target is large enough.
If the selected target is not unallocated space, disk image software Active@ Disk Image must have exclusive access to the target partition while writing the clone data.
Before you confirm the details of the operation, data backup software Active@ Disk Image attempts to lock the target partition for exclusive access.
If another application or the operating system is using the target partition, you must close all applications or system processes that may be using the target partition.
If you cannot lock the target partition after closing applications and system processes, there are other alternatives that you may try:
Although force volume dismount will work in most cases, it will not allow exclusive access when you are writing to a system partition or to a partition that is involved with system memory pagefiling.
If you are dealing with either of these two cases, you may run data backup utility Active@ Disk Image from a bootable CD or start your computer in such a way that the target partition is not part of the operating system.
You can do this on a computer with multiple systems installed, by booting a different system or you can remove the target disk and install it into another computer where it will not be a system disk.