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Format the memory card. This clears all data from the card and prepares it for further use.
Make sure the card isn't protected. SD cards have a slide switch along one edge. The position farthest from the metal contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.
Digital cameras that come with internal memory usually have a very small amount of storage capacity (usually 32 or 64MB). I'm not sure why the manufacturers even bother with internal storage when you can get memory cards that have much more capacity. You need to either download the photos you've taken to your PC and then delete the photos so you can take more shots, or you need to insert a memory card. Depending on your model of camera you need a microSD or SD card. Let me know the model number of the camera and I will tell you what you need to get.
Reformat the SD card with your computer. This will delete all data on the card. Do you use a usb cable to upload pics to your computer or put the SD card in a media slot? Either way, find the drive that corresponds to your SD card or camera in "My Computer". Right click on it and select 'format'. A new window will open with a check box for 'quick format'. Check the box and click OK. A prompt will appear stating all data will be erased. Click OK. In a few seconds, the card will be reformatted.
Copy the existing photos on to your PC, switch off the camera. Remove the SD card and format the SD-card using a SD-card reader, this will clear all the card contents. Now try using it in your Camera again. Ideally, you should be able to save photos on this SD card. Other way would be to insert another SD card into your camera and click photos and check whether those photos are being saved into the SD card(this can be done using display option in your digicam.)
You cannot erase the card fromm the camera(You can delete the pic one by one using the delete option though). However you can connect the cam to your PC using the USB cable. The cam will be shown as a drive. Just right-click and click format. As for the flash no, you dont have to hit the flash button for every pic.
There are companies that claim to be able to retrieve deleted files on mem cards, if their space has not been written over by other pics taken sense, or a mem card FORMAT. Google it.
Your better approach may be to try to recover the files showing 3Meg size on your computer download. Sounds like mem card quit working correctly after first 100 photoes. Was this a name brand SD card like San Disk or Panasonic? Beware of off brand junk sold on ebay or other sites CHEAP. They are designed to report back the size they claim to be, but are 1/2 size capacity or less in reality. You never know until you need your photos. The other thing is SD cards fail and are never a good as a BackUp source for files. For file xfers only in general.
Good lesson for all is to be sure all your pics show up on your computer before deleting on camera.