Sony PRS-T1 User Manual page 140

 If you experience difficulties when drawing on the Reader:
 avoid applying excessive pressure to the screen.
 try not to draw too quickly.
 this functionality is not designed for very detailed
drawings or for writing small characters.
Tip
 If you tap [New] while creating a drawing, the current
drawing is saved, and a new canvas opens.
 These drawings will be saved only in the internal memory.
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