Problem with i.tape.mss

  We're trying to extract images from MSS tapes (6250 bpi).
if we enter start and end values as
  rows:1-2984
  cols:1-3548

  rows 1-1491 are extracted and then it asks for the TAPE 2 to be mounted.
But if we run i.tape.other we can extract all the rows (hence the complete image).
Can someone tell us the reason behind this ?

  Thankyou,
  Laxmi P. Musunur (LP)