I can not find anything that says the 8400 can handle SDHC cards.
The specifications say SD cards.
Any SD card that has a capacity of 4 gig or higher is called SDHC.
The HC means high capacity.
It takes special firmware in the camera to be able to handle HC cards.
The problem with your card reader is likely caused by trying to read HC cards too.
You must use a card reader that is qualified for HC cards.
I suggest you buy a SD card with a capacity of 2 gig or less.
I have a vivitar 8400 digital camera.
I get a card read error on my 8gb scandisk sdhc memory card. the camera works fine without sd card in.has 32 mb internal memory.the old card doesnt work in my cardreader on my pc either. card reader works with other media. I purchased 2 new 8gb sdhc cards and get same card read error when i put either in the camera. both brand new cards wont work in the card reader on my pc.
The camera works fine on internal memory.I can use usb cable without card in camera and can view pictures.camera comes up as drive letter L:. The card reader slot that reads sd cards is drive letter J:.
I checked device manager and get yellow circle and black exclamation point.check properties and says drive is set to safely remove. unplug cardreader and reinstall. I did that and card reader shows up in device manager ok. I can click on J: and get message to insert diskand when i insert sd card into slot and nothing happens . locks up pc and have to reboot.
i called vivitar and they said cards should work in camera. they said also that they would call me back within 48 hrs.
I cant tell what is corrupting cards. Also i cant formatt new cards in camera . dont get format completed message .
anybody have any ideas. am going to try another cardreader over my friends house to check cards.
anybody hav eany ideas .