This chapter discusses the necessary steps to dual boot.
3.1. Creating Free Space
To dual-boot TrueOS® with an existing operating system, first make sure
there is either a free partition or an area of free space to use. For
example, a system running the Windows operating system usually occupies
the entire hard drive. The partition with the current operating system
needs to shrink to make room to install TrueOS®. Shrinking is an
operation which retains the current operating system while reducing the
size of its partition. This section demonstrates how to create free
space within Windows 10.
Before shrinking a partition, be sure to back up any
valuable data to an external media such as a removable USB drive!
To shrink the drive, right-click the Start menu and click
Disk Management. In the example shown in
Figure 3.1.1, the Windows system has three
partitions: a 450 MB recovery partition, a 237.93 GB data partition, and
a 100 MB system partition.
Fig. 3.1.1 Disk Layout in Disk Management
This image shows all three Windows partitions filling the entire disk.
The data partition must be shrunk to create space to install TrueOS®.
Right-click the data partition (in this example, the (C:) partition),
and select Shrink Volume, as shown in
Fig. 3.1.2 Shrink Volume Menu Selection
Wait as the volume is queried for available shrink space. The results
are shown in Figure 3.1.3.
Fig. 3.1.3 Available Shrink Space
Here, 119307 MB of space is available. This is the maximum amount
Windows can shrink this particular partition. Accept that number, or
choose a smaller number for a smaller TrueOS® partition. Click
Shrink to begin the shrinking process. This procedure can
take several minutes to complete. When finished, the newly created free
space is displayed as seen in Figure 3.1.4.
The minimum requirement for a TrueOS® install is 20 GB. It is
recommended to have 50 GB.
Fig. 3.1.4 Disk with Free Space
It is important to not choose to install TrueOS® into
any of the three Windows partitions at the Disk Selection
screen of the installer. It is a good idea to write down the sizes of
all of the partitions so the free space is recognizable when the
TrueOS® installer displays the current partitions.
3.3. Dual Booting
A TrueOS® installation assumes there is an existing GPT or primary
partition for installation. If the computer has only one disk and
TrueOS® is the only operating system, it is fine to accept the default
partitioning scheme. However, if TrueOS® is to share space with other
operating systems, ensure TrueOS® is installed into the correct
partition, or an existing operating system may be overwritten.
As adjusting the partitions/spacing on active disks can be a
complicated and difficult process, it is recommended to partition
your disk for dual booting before installing any operating systems.
When installing TrueOS® onto a computer meant to contain multiple
operating systems, carefully select the correct partition in the
Disk Selection screen. On a system containing multiple
partitions, each partition is listed.
Avoid selecting a partition containing an operating system
or essential data.
Highlight the desired partition and click Customize.
Clicking Next without customizing the disk layout results
in the installer overwriting the contents of the primary disk.
Once installed, the system boots into the rEFInd menu seen in
Fig. 3.3.1 rEFInd Boot Manager
rEFInd displays any installed operating systems and boots into the
default choice after a few seconds. Press any key other than
Enter to pause automatic booting, then use the arrow keys to
select the desired operating system. Press
Enter to continue