System Administration Guide, Volume 1

File System Parameters

To make a new file system on a disk slice, you almost always use the newfs command. The table below shows the default parameters used by the newfs command.

Table 35-1 Default Parameters Used by the newfs Command


Default Value 

Block size 

8 Kbytes 

Fragment size 

1 Kbyte 

Minimum free space 

((64 Mbytes/partition size) * 100), rounded down to the nearest integer and limited to between 1% and 10%, inclusively 

Rotational delay 


Optimization type 


Number of inodes 

1 for each 2 Kbytes of data space