Change default init sizes from 64 kB to 60 kB, since the block device interface limits it to this anyway.
Change default init sizes from 64 kB to 60 kB, since the block device
interface limits it to this anyway.

Change the name of the v flag variable from 'verbose' to 'vflag',
indicating the multiple use (verbose or verify).

Add -S flag to specify the size of some operations.

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