Any new card that you try to use, 64gb or larger capacity (SDXC) will fail, because unfortunately, an SDXC card, 64gb or larger, will not work in this camera. Because it was made around 2010, before the larger capacity memory card format was finalized and incorporated, the Pentax 90X model can only use SD (up to 4gb) & SDHC (up to 32gb) cards that are up to 32gb or less in capacity. Please see th Pentax information at the link below.
If you require additional information, please use the Reply to ExpertTab to contact me. Click the ratings only after our exchange iscomplete and you are satisfied.
If you are satisfied that my answer is accurate or has provided a reasonable alternative solution, please do not forget to rate my answer OK, Good or Excellent.