I have a Dimage z2 and had the same problem. I formatted the SD card using my PC - which did not correct the problem. Card still read "unable to use card". I finally formatted it using the camera and this solved the problem. The card I had problems with was SanDisk 256MB. Everything works great now.
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The Z6 uses MMC and SD cards. If you look carefully at your 8GB card, you'll see that it's an SDHC card. While it fits into the slot, it is electronically incompatible and will not work. The Z6 is limited to cards 2GB and smaller.
The Z6 works with MMC and SD cards. Your 8GB card is actually an SDHC card. While SDHC cards will fit into SD slots, they are electronically incompatible and will not work. You need to use MMC or SD cards, 2GB and smaller.
Look at your memory card. SD cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card. If the switch is already in the proper position, slide it fully the other way and then back again.
What size card is it? You should go to Konica Minolta USA Web-Site and look up your camera under discontinued products to see what the largest card your camera can handle as you may have a card that is to large for your camera format ....
My Z6 worked flawlessly for over a year, then suddenly started shutting
off for no reason. Tried new batteries, etc. The problem turned out to
be the memory card. My advice, buy a GOOD card instead of a new camera!
Keep in mind, flash cards DO have a "life" to them - meaning they can
only be used / erased so many times before they will cause errors (so
don't buy a used card off of ebay - no matter HOW good the deal seems).
If your shutdown problem started with a "unable to read card" warning,
then its the card. The camera is actually "protecting" itself by
shutting down. Good luck!