EXP Computer Hard Disk Traveler Plus - Manual (Page 19)

Symptom: The EXP HD starts to become excessively slow or behave differently on a battery-
powered notebook computer.
Solution: If you are using a notebook or laptop computer, without the AC adapter. The
performance of the parallel port may become sluggish and unreliable if the battery
runs low. Try reconnecting the AC adapter to your computer or recharging the
battery.
Symptom: The EXP HD starts to become excessively slow or does not work at all.
Solution: The parallel port on your machine may be able to a number of different modes,
standard, Bi-directional, EPP or ECP. These different setting can effect performance
of the EXP HD. In some cases, the standard setting will even shut off signals the
EXP HD needs, while if the same port is set to Bi-directional or EPP produce an
excellent performance.