When I insert a new memory card into my Z730 it tells me "memory card must be formatted" but it will not format. The memory card that is currently in the camera works fine!

Please confirm the model # so that I can check whether the large capacity memory cards are compatible with your camera.

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The C630 does not work with SD cards bigger than 2GB. The max specifications for this camera are SD card up to 2GB and SDHC card up to 4GB.

Here compatible memory cards:

Amazon.com: 2GB SD MEMORY CARD for KODAK EasyShare C533 C613

New 4GB Genuine Patriot Memory Card for Kodak Easyshare C613 ...

If the Camera is new or the SD Card is new then you don't have much problem,
use the installation CD that comes with the camera to install it driver on a computer, so can use the USB cord to explore the camera. on the computer, try to locate the SD Card and format it. then you can use the camera again.
If you have files on the digital camera then i am afraid you might have connected the camera earlier with a virus infected device. there is no choice but to fellow my step either to scan it with computer or better still format it with computer.
Hope to know the outcome!!

There are several possible causes for "memory card locked", "memory card error", or "no memory card". Some include trying to use a 4GB SDHC card with an older camera made before SDHC format came out. Others include problems with the tiny slide switch on the side of the card, or the electrical contact switch internal to the camera. The problem may also arise from simple formatting problems if the card has never been formatted in the camera (note that this will also erase the card). Troubleshooting tips for this problem may be found at this link. By the way, the Z730 was made before SDHC came out. Only consider 2GB or less standard SD cards. They're very inexpensive these days on Amazon.

im sorry but, you need to get a new memory card

First, be sure the card slide switch is in the unlocked position. Then, insert the card,ignore the message on the screen and go into the camera menu to find "format"...then, follow the on-screen instructions.

hello

Insert your memory card into your computer's reader if you have one. If not, you can purchase a multi-format USB Memory Card reader from Amazon.com or Buy.com

2 Open up 'My Computer'. You should see it under the list of available drives.

3 Check its contents first to make sure that you have the right drive.

4 In 'My Computer', right-click on the drive and choose 'Format'.

5 Leave all the options as they are and click on 'Start'. This is a non-reversible process so make sure this is what you truly wanted to do in the first place.

6 Once the process is completed, take the memory card out and insert it into your Digital Camera or any other device. Try to browse to it to make sure it works fine now.

1. Insert the memory card into the camera. Make sure the card is firmly seated (push in the card until it clicks into place).
2. Turn on the camera.
3. Press the Menu button, then go to the Setup Menu.
4. Scroll up or down to the Format option, then press the OK button.
5. Follow the prompts to format the memory card.

Retrieved from www.kodak.com.

their shut be a drop down screen on your camera and one of the options is format memory card

Use the camera to format the SD card not your computer. There should be a menu option to format it.