I think that depends on how your file system works and what it supports. For e.g. vxfs (Veritas Journal) supports a block size specifier with mkfs (newfs) and also uses an extent based allocation.

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Patrick Van der Veken - UNIX consultant (c) 2001 - 2001 http://www.baanboard.com - http://www.ux-core.com
'True strength lies in gentleness' - Irish proverb