What are these things and why are they in every device I have???
Actually, they are not in everything. Â Plenty of your stuff has a good old-fashioned harddrive in it. Â However, your MP3 player (not ipods), your digital camera, and even your cell phone might be remembering for you on flash memory. Â So why not learn a snippet or two about flash memory and SD cards? Â
What you need to know:
Despite my introductory bravado, there isn’t much that you need to know about an SD card. Â You should understand that it’s something called non-volatile memory, so it doesn’t need power to remember what you stored on it. Â Also, it’s faster than a hard drive, because it doesn’t have any moving parts (it kinda zaps the information onto electric switches – this is called Sold State). Â This whole solid state thing is good for battery life too. SD cards are also pretty hardy. If you drop your card, it’s going to be ok… Â A harddrive has moving parts that get damaged easily (try-please don’t- dropping your ibook). Â SD cards don’t (almost) bounce in comparison…
The only thing you have to remember:
SD memory is hardy but not invincible! Â Your SD card has a predetermined lifespan (like anything else), measured in writes/reads/cycles. Â Your card might last 10 years of hard use, but it probably won’t (after a year I’d start being cautious). Â The point to remember? Backup your cards often!Â