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▀ If this function is never called by the program, the DTA defaults to a
  128-byte buffer at offset 0080H in the program segment prefix.
 
▀ In general, it is the programmer's responsibility to ensure that the
  buffer area specified is large enough for any disk operation that will
  use it. The only exception to this is that MS-DOS will detect and
  abort disk transfers that would cause a segment wrap.
 
▀ Int 21H Function 2FH can be used to determine the current disk transfer
  address.
 
▀ The only handle-type operations that rely on the current DTA address
  are the directory search functions, Int 21H Functions 4EH and 4FH.
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