When SD memory cards came out, I was quite excited. The storage space available on such a tiny piece of plastic was amazing. I was quickly dismayed as they topped out at 4 GB. Then the SDHC cards came out. I was excited again, but I being a greed consumer wanting more and more storage, I was once again disappointed as it topped out at 32GB. Due to limitations on transfer speeds and file systems SD cards have gone though a few upgrades.