Default block size for UFS format in OSX?

Hi,
I formatted an external drive as "unix format" (UFS) using Disk Utility, which subsequently became unrecognizable by the firewire controller. Now in a Unix box, the superblock of this drive is coming up as corrupted or nonexistent. Does anyone know where I can find the default block size for UFS in os x? I need to specify a backup superblock. Thanks!
-Dan

If it is just scratch, run some benchmarks with it set to 128k and 256k and see how it feels with each. The default is too small, though some find it acceptable for small images. For larger files you want larger - and for PS scratch you definitely want 128 or 256k.

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