0 

root (/)

Both 

Holds files and directories that make up the operating system. 

EFI – You cannot boot from a disk with an EFI label.

1 

swap 

Both 

Provides virtual memory, or swap space.

2 

— 

Both 

VTOC – Refers to the entire disk, by convention. The size of this slice should not be changed.

EFI – Optional slice to be defined based on your site's needs.

3 

/export

Both 

Optional slice that can be defined based on your site's needs. 

Can be used on a server to hold alternative versions of operating systems that are required by client systems. 

4 

Both 

Optional slice to be defined based on your site's needs. 

5 

Both 

Optional slice to be defined based on your site's needs. 

Can be used to hold application software added to a system. If a slice is not allocated for the /opt file system during installation, the /opt directory is put in slice 0.

6 

/usr

Both 

Holds operating system commands (also known as executables). This slice also holds documentation, system programs (init and syslogd, for example) and library routines.

7 

/home or

/export/home

Both 

VTOC – Holds files that are created by users.

EFI – Not applicable.

8 

N/A 

N/A 

VTOC – Not applicable.

EFI – A reserved slice created by default. This area is similar to the VTOC's alternate cylinders. Do not modify nor delete this slice.