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You need to have Windows ADK 8.1 installed download the Windows Assessment and Deployment Kit (Windows ADK) for Windows 8.1 Update here.How this app – Create UEFI Bootable External USB Drive gets installed All bootable files are copied to the “WinPE” partition and therefore visible to all UEFI systems. The first partition is formatted as FAT32 with label name “WinPE” and the second one is formatted with NTFS file system, labelled “ImageData”, and available for storing image files larger than 4GB. Here, I will use the same idea with one important difference – creation of multiple partitions on a single USB drives that report themselves as FIXED disks. In my blog “ WinPE – Dual Boot External USB Drive”, I explored an idea of using WinPE 5.0 and External USB Drive to create a simple solution for capturing and deploying images with ImageX.exe tool. Most USB Flash sticks report themselves as removable but the USB connected Hard Drives report themselves as FIXED disks, and therefore allow us to create multiple partitions on this type of the USB external drives. For example, “E:\images\install*.swm” will apply all of the split files in the E:\image directory named install1.swm, install2.swm, and so on. To apply an image from the E:\Images folder using DISM /Apply-Image command, type the following:ĭism /apply-image /imagefile:install.swm /swmfile:E:\Images\install*.swm /index:1 / applydir:C:\Īs you can see it is possible to use wildcard characters. 4700 is the maximum size in MB for each of the split.E:\images\install.swm is the destination name and the location for the split.C:\images\install.wim is the name and the location of the image file that you want to split.To work around this problem, you have two alternatives:ĭeployment Image Servicing and Management (DISM) tool supports the /split-image command and could be used as described in the following example:ĭism /Split-Image /ImageFile:C:\install.wim /SWMFile:E:\images\install.swm / FileSize:4700 If any of the image files to be deployed are larger than 4GB you would not be able to store that file on the USB drive with formatted FAT32 partition. But there is an obstacle UEFI based systems require that all boot files reside on FAT32 partition which has a 4GB individual file size limitation. As an owner of a UEFI system such as Surface Pro, you could use a bootable USB drive as a recovery media or maybe to create and deploy images.

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In this blog I am going to discuss how to create a bootable USB drive for UEFI (Unified Extensible Firmware Interface) devices running Microsoft operating systems (Windows 8.1 or Windows RT 8.1). Update: If you want to learn more about WinPE UEFI and Windows 10 OS, please check my blog WinPE GUI-Windows 10.
