Best SD card to USB adapters?

I’ve got a handful of old SD cards lying around and I’m trying to figure out how to actually use them—specifically by popping them into a USB adapter so I can play some MP3s through my car stereo.

I’ve been scrolling through eBay and there are a ton of these little gadgets, but most of them are listed as standard card readers meant for plugging into a PC. That leaves me wondering: will they actually work as an SD-to-USB bridge? Basically, if I shove an SD card into one of these, will my car's head unit just see it as a regular thumb drive?

For instance, would this or maybe this
do the trick?
If those aren't what I'm looking for, please hit me with a recommendation—maybe an eBay link for a specific adapter that lets me treat an SD card like a standard USB stick for the car.

Or, if there's somewhere local—like a Best Buy or something—where I can pick one up without breaking the bank, feel free to drop a link for that too.

Thanks!

First off, you really ought to double-check if your radio can even handle this format—I mean, seriously—so maybe take a quick look at the manufacturer’s website to see what the specs actually say.

Benjamin King2 said:You really ought to double-check if your head unit can even handle that format in the first place. Maybe take a quick look at the manufacturer's spec sheet online.

The radio definitely reads USB sticks—I know that much—but I’m just not sure if the hardware will actually recognize an SD card tucked inside an adapter as a standard thumb drive. It's one of those "maybe" situations.

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