Image replicator media sd tar unbootable

SD Card	/sdimage.tar.xz /sdimage.tar.bz2 /sdimage.tar.gz /sdimage.tar	Tar of the filesystem. This will repartition the SD card to a single partition and extract this tarball to the filesystem. If present, a file named /md5sums.txt in the tarball will have its contents checked against the whole filesystem after the tarball is extracted. This md5sums.txt file is optional and can be omitted, but it must not be blank if present. This file is present in our official images and is created during image capture with the Image Replicator tool. Note that on this platform, writing a tarball to the boot media will not result in a bootable device! Only disk images are bootable for this platform as they contain the bootloader as part of the image. A tarball, however, can be used to format and write data to a secondary media that would not need to be bootable in an application.
	/sdimage.dd.xz /sdimage.dd.bz2 /sdimage.dd.gz /sdimage.dd	Disk image of the media. This will be written to the SD card block device directly. If present on the USB Image Replicator drive, a file named /sdimage.dd.md5 will be used to verify the data written to the SD card against this checksum. This file is provided with our official images and is created during image capture with the Image Replicator tool.