Problem with sd

https://support.nikonusa.com/app/answers/detail/a_id/14288

Look at your memory card. SD and SDHC 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.

The D50 works with SD cards. Your 4GB card is actually an SDHC card. While it fits into the slot, it will only work with devices specifically designed to accept SDHC cards. The D50 wasn't. It only works with SD cards, 2GB and smaller.

SD and SDHC cards fit the same slots, but many cameras won't work with the SDHC (high capacity) cards. SDHC is not backwards compatible.

You don't really need that big a card. If you want more space (going on holiday?) just carry a couple of spare 1GB cards, and change them when they get full, like people used to put in a new film.

The S1 uses SD cards. SD cards top out at 2GB, any larger cards are actually SDHC (Secure Digital High Capacity). SDHC devices will accept SD cards, but SD devices will not accept SDHC cards. They will fit physically but not electronically.

In fact, the S1 manual does not list any cards larger than 1GB.

The higher the class number, the faster the card will record the video with no problems. Go for the Class 10.

The D50 will only accept up to a 2gb SD card. Cards of 4gb and larger are a newer type of SD card, known as SDHC (secure digital high capacity). At the time the D50 was made, SDHC cards weren't on the market. In short, if it is larger than 2gb it won't work. There's also no upgrade that I've found to handle SDHC cards in the D50, either. I love my D50, except for the card limitation.

The D50 works with SD cards. Your 4GB card is actually an SDHC card. While it fits into the slot, it will only work with devices specifically designed to accept SDHC cards. The D50 wasn't. It only works with SD cards, 2GB and smaller.

It thinks that the SD card is full - try re-formatting if you have no photos there. The SD functions the same as a PC hard drive, and if the directory 'tracks' are corrupt, anything could happen. Else try a new SD card.

Hello. Make sure the write-protect switch on the SD card is in the UP (nearer to the contacts) position. Try the card in an SDHC capable reader on your computer first. Note that the SD card can only be inserted one way - make sure you're not putting it in upside-down! If the computer recognizes the presence of inserted card (whether it can read it or not), format it at FAT32. When finished, remove properly (icon in system tray) and insert into your D40 slot, WITH THE CAMERA OFF!! Turn on the D40, and if it now recognizes the SD card, FORMAT it again, in the camera. Good luck.