The only difference between Windows and GNU / Linux is the naming of the partitions.
> Windows uses letters (hence a limited number of partitions).
> GNU / Linux uses a combination of letters and numbers but the letters representing type of equipment (HD to an internal hard drive, SD for a SCSI disk.) Here, therefore, no limits partitions!
2 - Partitions under BSD subsystems
BSD systems require a score they are then cut into slices.
The partition, in the traditional Windows and Linux, includes BSD operating system.
The BSD operating system is divided into several slices. Generally, isolation and / (root), / usr, / var, / tmp, / home and swap. Each installment is differentiated by a letter. But naming slices varies between NetBSD, OpenBSD, FreeBSD. Therefore better to relate to this level of documentation devoted to precisely target BSD.
3 - Saving a slice BSD
This system partitioning - partition cut- BSD may seem bulky, since operating systems BSD does not detect partition and slices.
It is however more complicated to create a system image (ghost image) and / or recover data lost by mistake!
Of course you can keep backups of your personal data by creating a tar.gz archive
To create a system image, rather think the dd command creates a physical copy block by block.