Prepare a USB flash drive to be a bootable disk

You can use a USB flash drive to make your device to boot from the freshly-built OS on your network-connected host development machine. Alternatively, you can also direct your device to boot from the OS on the flash drive itself.

Automatic configuration

To prepare a USB flash drive to be a bootable disk for your device, complete the following steps:

Run the following command to set the build configuration:
```
fx set core.x64
```
Run the following command to build the fuchsia image:
```
fx build
```
Run the following command to create a zedboot key, replacing DEVICE-PATH with the path to your target device:

Note: To find the device-path to your USB drive, you can run lsblk. If you identify your USB drive as sda, your device-path is /dev/sda/.
```
fx mkzedboot DEVICE-PATH
```
This command requires that you sudo into your machine. As a result, you will need to enter your password after running fx mkzedboot.

The mkzedboot command does the following:
- Creates a File Allocation Table (FAT) partition that contains an Extensible Firmware Interface (EFI) System Partition. The EFI System Partition contains the Gigaboot EFI bootloader and a configuration that specifies that your device always boot into Zedboot.
- Creates a ChromeOS bootable partition with a developer key signed Zedboot kernel partition.
Connect your device to your host through built-in ethernet.
(Optional) To pave your target device with Fuchsia, run:
```
fx pave
```
(Optional) To netboot your target device, run:
```
fx netboot
```
Power on your device.

Manual configuration

Manually creating an EFI boot key is no longer supported.