SDHC cards, in addition to being larger capacity, often seem to be labeled or described with speed ratings whereas SD cards typically don't. Or so I observe while looking at product lists on various ...

My car stereo (Parrot SMART Asteroid) can read MP3s off a USB 2.0 drive or SDHC card. Which is faster? I believe that USB 2.0 maxes out at 30 MB/s and I think SDHC is around the same time, right? What ...