The INITIAL parameter in the STORAGE clause determines how much space will be allocated to the first extent when an object is created. This parameter may be specified in bytes, kilobytes, or megabytes. For example, the following all specify the same amount of storage to be allocated to the INITIAL extent:
INITIAL 1048576 INITIAL 1024K INITIAL 1M
The default value for INITIAL is the INITIAL value established in the DEFAULT STORAGE for the tablespace in which the object is being created.