Can I use a 4GB SDHC memory card in my samsung sl310w camera?

Nope, it was made before 4GB SDHC as explained in this video.

Yes and no. According to the manual the S630 will work with SD cards up to 2GB in size and with 4GB SDHC cards. If the cards at the store are actually SDHC cards (most likely since 4GB SD cards are very rare) then they should work fine.

The problem is that your camera is only compatible with SD cards, not SDHC cards. You bought a larger card for your older camera, not noticing that it was SDHC (or not knowing that it mattered). The new card doesn't work, not because it or the camera is broken, but because it's not compatible.

Cards up to 2Gb are generally SD.
Cards of 4Gb are generally SDHC.
Cards over 8Gb have to be SDHC.

(There are exceptions. Sometimes, manufacturers make 4Gb SDHC cards but some have errors; they disable half of the chip and sell it as 2Gb, but it's still SDHC. 4Gb cards are almost always SDHC because they're cheaper, but 4Gb SD cards do exist. They are so rare that I've even seen a guru on this site claim they don't. I did own one once, but it was very expensive and turned out to be so unreliable that I had to return it. I don't recommend looking for one, because of the problems.)

Your solution is to go find a 2Gb card, and be extra sure that it doesn't say "SDHC" on it.

Your model camera can only use up to a 2GB standard SD cards, and not 4GB or higher SDHC cards. There are several other possible causes for "memory card locked", "memory card error", or "no memory card". The most common is trying to use a 4GB or higher SDHC card with an older camera made before the 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.

A 4GB memory card will be an SDHC type. 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.

Your problem is that your camera only takes standard SD cards up to a maximum of 2GB. The card you have bought is likely to be a 4GB SDHC model. SDHC is a later development of SD; SDHC compliant devices can still use older SD cards, but SD-only devices cannot use SDHC. This is a hardware limitation so there is no way at all to use an SDHC card in your camera.

Note that if your 4GB card is definitely an SD and not an SDHC then it's still incompatible with your camera: very few standard SD devices were ever made with the firmware and hardware to handle the different memory addressing architecture used by the larger capacity card. Some cameras did have firmware updates to allow the larger SD card to be used, but yours is not one of them.

Your only fix is to sell your card (or keep it for another device) and to buy a regular SD card no larger than 2GB maximum capacity.

I trust that my reply has answered your question fully, please take a moment to rate my answer.

The NV10 will not accept SDHC type memory cards. The largest card you will find it takes is a 2GB card of the SD type (not SDHC). The camera is not SDHC compliant, unfortunately. If you can return the 4GB Lexar, swap it for a 2GB of the non-SDHC variety. If this answers your question fully, please rate the solution accordingly. Thanks

According to Samsung's page on this camera, the following memory can be used:

External Memory(Optional) : Micro SD (up to 4GB)
Micro SDHC (up to 8GB)

4 GB is acceptable, but I think you do not have the correct type of card. You should be using a Micro SD or "Micro Secure Digital" (up to 4GB capacity) or a Micro SDHC or "Micro Secure Digital High Capacity" (up to 8 GB capacity) card. This is very different from an SD or SDHC card. These Micro cards are very small (smaller than your thumbnail) and are often packaged with an SD adapter card. Regardless if sold with or with out the adapter, the package should say Micro SD or Micro SDHC on it somewhere.

emm... I have got an 2 gb SD memorycard for mine to and it wont work. Read on several places that the camera can only handle 1 gb memory card... Dont know if that's true thou.

Do the 4GB Cards say SDHC on them? They should. SDHC is simply "Secure Digital High Capacity". They're high capacity SD cards that hold more than regular cards. In this case, 4GB. The problem with these is that they need to be supported by the device. I've never put an SDHC card into a device that doesn't support them, but it looks like that's what your situation is. The highest memory capacity a non-SDHC compliant device is capable of 2GB. I recommend that you return the 4GB cards and buy 2GB cards instead.