Tip about cameras with Memory Care Errors

Also, the newer SD cards may be too fast for your camera.
My older DX6340 cannot handle the newer high speed SD cards.

Have you used the correct card?

It's very common for users to try too large a capacity or even the later SDHC cards which were designed long after your PowerShot SD400 / Digital Ixus 50. That camera can only accept SD cards to a maximum 2GB capacity, and with some brands it's a bit fussy and will only accept 1GB.

Also note that your camera does not need high speed SD cards, if you put an advanced speedy model in there it will work (subject to the previous restrictions) but your camera lacks the ability to make use of the speed.

The A530 is designed to work with SD cards, not SDHC cards. You'll need to go with cards 2GB and smaller.

Make sure this card is a Secure Digital card; make sure the card is in correctly. Also, some of these Acer cameras use the older SD cards, and are not compatible with the newer generations.

To achieve MPEG2 video performance, large amounts of data must be written to the SD Memory Card in real time. The read and write speed of the SD Memory Card may differ from manufacturer to manufacturer, so we recommend using Panasonic SD Memory Cards with the high-speed transmission rate of 10MB per second (SD Memory Cards that are 256MB* or higher have a transmission rate of 10MB per second).