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Windows Backup. It's free and built into Windows.

It creates a full image that is guaranteed to boot properly when you restore it. There is no need to operate outside the Windows environment to do this.

heero, your information is outdated. Windows does not allocate drive letters sequentially at boot time. Drive letters are stored persistently on disk. This is what causes the problem if Windows actually mounts the clone after it is created. Copying files is nothing like creating an image or a clone. NTLDR does not exist anymore.

If you create an exact copy it will quite literally be an exact copy and behave exactly the same including booting exactly the same.

If you clone a disk from HD0 to HD1 and then boot from HD1 as the only disk like you claim, then it will boot perfectly fine because HD numbers are allocated sequentially at bootup, therefore whatever disk automatically becomes HD0 when it is the only disk.

Also do NOT use fdisk or fdisk /mbr. This is *not* an undocumented switch, it's quite well documented, but nonetheless the fdisk tool is out of date and has been obsolete for a decade. All current versions of Windows have replaced fdisk and ntldr. The correct tools to use are now diskpart and bootsect if you really need to fix the partition configuration, which you will not because a clone by definition already includes an identical copy of the MBR and boot sector.