writing to the Seeed studio SD shield v 4.0

Hi, just to ask if anyone can help me find a reliable way to save data onto the Seeed studio SD shield v 4.0

I am using the Arduino uno and the SD shield and nothing else.

The problem is that I cannot reliably save data onto the card. It seems to be very intermittent. Also I want to remove the card periodically to transfer data to a PC and not sure if I need to power down the unit beforehand? - any help will be much appreciated

many thanks for your help

cheers

gelato2

The problem is that I cannot reliably save data onto the card. It seems to be very intermittent.

Some code you haven't posted has problems using some hardware that you didn't provide a link to, but you want us to explain why. I'm going to have to pass.

Also I want to remove the card periodically to transfer data to a PC and not sure if I need to power down the unit beforehand?

I am sure that you DO need to, unless you have some way to tell the Arduino to stop trying to write to a card that may not be there, which causes it to close any open files.