The BlockSize property specifies the formatting size unit for tapes formatted as part of a backup.
object.BlockingSize [= value]
object
Expression that evaluates to an object in the Applies To list
value
Long integer that represents a number of bytes
Long
Read/write
HRESULT GetBlockSize(LPLONG pRetVal);
HRESULT SetBlockSize(long NewValue);
When directing a backup to a backup device or to files, BlockSize is ignored.