Question about Canon PowerShot SD550 / IXUS 750 Digital Camera

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Unlock card OK, so I am a tech idiot. I just bought a new Canon S3 IS camera and am trying for the first time to insert a memory card (Sandisk Pro Duo 2MG). I think I have it inserted, but the camera reads "memory card locked". How do I unlock the memory card?

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Re: unlock card

Take the card out from the camera & you should see a small slider on the side. Set the slider "up" as per the attached picture. Please update the question & let us know if the information given was useful to you - Good Luck!

Posted on Aug 26, 2007

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Re: unlock card

Uhhh... Heh...

Here's the ACTUAL problem.

You have a "Memory Stick PRO Duo".

That is a SONY memory card and will only work in SONY products.

This is not a matter of compatability so much as it is PHYSICS.

This card WILL NOT work with the camera. You have to go and buy an SECURE DIGITAL card. (The kind of card depicted in the first post here.)

This camera is only compatible with SD cards. I recommend a HIGH-SPEED SD card for this camera. Allow me to paste you a product page on to indicate which one I'm talking about. (Memory capacity may vary - depending on how much you'll be willing to spend on it. I recommend minimum 2GB.)

For the price, this is an INCREDIBLY good deal. :)

Click HERE to see the product.

You should be able to find these memory cards in local retail outlets as well. Although they may cost more than getting them online. is a great place to get your computer products or electronics in general.

I hope you get this. This is an older post... Let me know.

But you can take this solution as 100% ACCURATE.

Hope to hear you got this.


Posted on Nov 17, 2007

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SOURCE: Memory card locked

Hi everyone,

Here's the solution, I just had the same problem LOL!
1. take the memory card out
2.On the memory card there is a little switch (it will be the little tiny piece on the side of the card thats a different color) slide it up.

That's it!


Posted on Jan 26, 2008

  • 1 Answer

SOURCE: sd card error on canon powershot s3

I get a memory card error everytime I insert a memory card. They are not locked and I have tried 4 different memory cards and nothing works. How can this problem be fixed?

Posted on Sep 27, 2008

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SOURCE: Loaded new memory card, and screen reads memory

I'm guessing you bought a new 4GB SDHC card. Although it looks exactly the same as a standard SD card, the format the card uses is very different. If your camera is more than a few couple years old, it's likely it was designed before the SDHC format came out. Sorry, but a SDHC card will not work with older cameras.
For older cameras, you'll need to use standard SD cards (usually those 2GB or less). But if you really want to use a 4GB card, do a Google search for 4GB SD "non HC", with the non HC in quotes. Believe Transcend makes one.

Posted on Dec 25, 2009

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