Using Disk Utility to erase SDHC card taking too long

So... I had this 32 gb memory card that neither my camera nor my computer would read (iMac running OS 10.9.5 Mavericks and the camera's a Canon Power Shot SX40HS, just in case that matters).
I decided to try erasing the card using disk utility just to see if anything would recognize it after that, since nothing else seemed to work. Now, it's says it's partitioning with an estimated time of 1 day! I suspect I did something wrong. Why is it partitioning? I just wanted it to erase the card! I don't really understand all the jargon in the disk utility, even though I've used it before. I chose the least secure erase setting so it might not be impossible to recover items.
Here's the screenshot of what it's up to- still. Am I formatting the wrong thing? I don't have anything else that's 32 gb that I know of, so I'm pretty sure it's the right item, but it's taking FOREVER! Can I stop it somehow, or would that wreck the card? I put the name as 32 GB Lexar, just to be clear what I was erasing, but maybe I've messed something up. HELP?

I'm not sure what you mean by a modern disk utility. It's what's on my machine. I have the latest version of the operating system that is available, as far as I know. I've tried to download Yosemite, but it wasn't available yet.
I just need to know how I can stop this process, as it is now showing it's up to 2 days and 14 hours! That's ridiculous.

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