Partition Scheme:

Create a $256$MB EXT$2$ partition.

Create a $1\mathrm{.}5$GB EXT$4$ partition.

Create a $2$GB Linux SWAP partition.

Set the boot flag on the $256$MB EXT$2$ partition.

MBR Extraction:

Write the partition scheme to the USB drive.

Extract the Master Boot Record $($MBR$)$ from the USB device.