Downloads‎ > ‎

Creating a Multi-Boot USB Flash Drive

The following procedure shows you how to make a multi-boot USB flash drive. In order to have both the 32bit and 64bit Centrych ISOs on it the drive must be at least 4GB in size. It must also not contain any important information since the drive will be destructively reformatted by this procedure.

The first step is to insert your drive into a free USB port, but do not mount it. If you've set your system to auto-mount removable media you will need to unmount the drive before continuing.

Note: this procedure assumes your USB drive is recognized by your system as /dev/sdb. Adjust accordingly if it is different.

The next step is to create a single FAT32 partition on the drive. You have two options for doing this, follow the GParted procedure or execute the following command:

sudo mkfs.vfat -F 32 -n MULTIBOOT /dev/sdb1

After the FAT32 partition has been created, execute the next two commands:

sudo mount /dev/sdb1 /mnt
sudo grub-install --force --no-floppy --root-directory=/mnt /dev/sdb

Now, download grub.cfg to the current directory and edit the file to change the filenames for each ISO to the version(s) you will be copying to the flash drive.

Once you've saved your changes, execute this command to copy it to your flash drive:

sudo cp grub.cfg /mnt/boot/grub

Download the 32bit and 64bit Centrych ISO images from to the current directory, then copy them to your flash drive with:

sudo cp centrych-desktop_*.iso /mnt

Once the copy is complete you can unmount the drive with the following command:

sudo umount /mnt

When you boot the flash drive you should see a boot screen similar to the following:

Select the appropriate entry with the Up/Down arrow keys, then press ENTER to begin booting that ISO image.