in my Pentax K-10D... happened thrice with 2 different cards 9both Sd high speed ones), two times while shooting and once after installing the card afer reading it in a PC...The card is unreadable, but works again when formatted. The cameras will ead other cards though on the spot. Seems something in the camera "kills" the card. So what can be happening? I did a shallow google search and hot nothing other than an occurance in an Optio and a Ninon... BTW the camera is already in the shop for monitoring (if and when it happens again)... thanks, Kostas ============================================= No matter what, CHEER UP MY FRIENDS! Life is too precious to jump the other side of the fence... kostas papakotas / clenched teeth photography http://groups.msn.com/clenchedteethphotographyHAM Radio: SW2MKL - Echolink node: SV2BZQ-R / R4 Edessa / 121496 | 