HP97 cant read card but writes fine

[damaltor]

Your motor speed might be too high. this will make the card fly through before all of the data is written, becuase writing is simply timing controlled and not bound the the cards movement. i had that once with a 41-card reader, and i adjusted the motor speed down. it worked ever since.

also the card might get pulled through too slow, which would make all data on only part of the card. this is far less likely though as those cards can usually be read on the machine they were written on (though not on any other machine).

Code:


Card too fast
|||||||||||||||||||||||||||||||||||||||||    Data
[---------------------------------]          Card

Card too slow
|||||||||||||||||                            Data
[---------------------------------]          Card