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 VolBlkSizGet()
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 Purpose:
 Get the block size of a volume.

 Syntax:
 iBlkSize = VolBlkSizGet( iVolNum )

 Parameters:
 iVolNum The volume number - 0 for the first volume, 1 for the second etc.

 Returns:
 A numeric value (signed short int).

 Description:
 VolBlkSizGet() returns the size of each storage block on volume number
 iVolNum.

 Returns NOVERRINT if an error occurs.

 Example:
 // To display the storage block size for the first disk volume:
 iBlockSize = VolBlkSizGet(0)
 if ( iBlockSize != NOVERRINT )
    ? "The block size of volume 0 is ", iBlockSize
 endif