Windows 8 now installs in EFI mode for computer hardware that supports EFI. Recent generations of PCs as well as Macs are capable of running Windows 8 in EFI mode, which speeds boot time compared to BIOS (legacy) mode. The technical aspects of EFI mode and legacy mode are beyond the scope of this document. The implications of EFI mode for newer Macs running Windows 8 in Boot Camp are nearly unlimited storage location and migration options. Below are some of the scenarios available using Winclone 4. The focus of this document is on the process of migrating an existing Windows 8 Boot Camp partition from the internal drive to a bootable external drive using Winclone 4.3.

- Migrate Boot Camp from internal to external bootable drive
- Run multiple bootable Windows 8 partitions on internal Intel Mac drive
- Run multiple bootable Windows 8 partitions on external drive attached to Intel Mac
- Migrate Windows 8 from a PC to Intel Mac
- Migrate Windows 8 from Boot Camp to a PC that supports EFI mode
- Create Winclone image of a Windows 8 PC drive
- Restore a Windows 8 Winclone image to a PC drive for use in a PC that supports EFI mode

In order to move your Bootcamp partition from your Mac to an external drive, it must meet the following requirements:

1. Intel Based Mac with EFI version 2 or greater (see http://support.apple.com/kb/HT1237)
2. USB or Thunderbolt External drive (USB Flash drives not supported)
3. Bootcamp partition with Windows 8 or Windows 8.1 installed

Before migrating Windows 8 Boot Camp to a bootable external drive, the drive must be formatted with the GUID partition scheme and partitioned with a MS-DOS (FAT32) partition. Keep in mind that this process will erase all existing data on the external drive, so make sure to back up any critical data elsewhere before proceeding.

Attach the external drive and open Utilities-> Disk Utility.

Select the external drive in the left side column. At the bottom of the Disk Utility window will be information about the disk. If the Partition Map Scheme is already set as “GUID Partition Table” you may skip to the section below “Create the Destination Partition”. If the Partition Map Scheme is anything other than “GUID Partition Table”, proceed to the section “Erase Disk”.

1. Make the external drive (and not the volume) is selected
2. Click the Partition tab in Disk Utility and in the drop down menu under Partition Layout, select "1 Partition". If you need other partitions in addition to the Boot Camp partition, you should create them now. You may also resize the Boot Camp partition and leave free space for later adding additional partitions.
3. Click on the box under the Partition Layout drop down menu to select it.
4. Enter a name for the partition and set the format to "MS-DOS (FAT)". You may also change the selected size by entering a number in GB. In our example, we will leave the Size to utilize all available space on the drive for a single MS-DOS (FAT32) partition.
5. Click Options to set the Partition Map Scheme to GUID Partition Table.

Select the GUID Partition Table option and click OK. The next step is to click Apply, which will erase all existing partitions and data and create a new partition table. Click Apply to accept the changes and create the new partition table.

At this stage you may be wondering "Why did we just create a MS-DOS (FAT32) partition when Windows 8 uses NTFS format?"

The reason for creating a MS-DOS (FAT32) partition as the destination for the migration is required because Disk Utility cannot natively create NTFS formatted partitions. Winclone will overwrite the MS-DOS (FAT32) format during the migration and the result will be a NTFS formatted Windows file system.

Once the partition has been created in Disk Utility, you may quit out of Disk Utility. Verify that the newly created partition is visible as a mounted volume on the Mac desktop. Open Winclone and select the current internal drive's Boot Camp partition in the Sources column. Or, if you have a Winclone image that will be used as the source for the migration, chose the Winclone image file in the Sources column. Select the new external drive MS-DOS (FAT32) volume as the Destination. Click the "Restore to Volume" button to begin the migration process.

Once the migration process is complete, open System Preferences -> Startup Disk. The new external drive should appear along with the OS X volume (and internal Boot Camp volume if it exists) and can now be selected as the startup volume. Optionally, restart while holding the Option key and the new external Boot Camp volume will be available for startup.