Sony PRS-T1 User Manual page 100

Notes on handwriting
 While writing, make sure that you are not touching another
area on the touchscreen; this could affect the notes that
you write with the stylus or your finger.
 To ensure that your notes are correctly saved, do not
handwrite notes too close to the edge of the touchscreen.
If you experience difficulties when handwriting or drawing
on the Reader:
 avoid applying excessive pressure to the
touchscreen.
 try not to handwrite or draw too quickly.
 this functionality is not designed for very detailed
drawings or for writing small characters.
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