| ??? 07/25/09 04:49 Read: times |
#167859 - There are advantages Responding to: ???'s previous message |
Jan Waclawek said:
Re 1: No doubt; but that sort of defeats the purpose of memory *card* doesn't it?
Re 2: Memory controller? It's not THAT hard to control a FLASH by a bunch of pins. Well, it doesn't use up all those pins Error detection and correction? Not a rocket science either... Nice if it's already done for you. Wear leveling on SD cards? Well, maybe... but let's face it, have you ever seen a solid written specs on common commercial SD card endurance? No doubt there are such, but they are not the over-the-counter types, are they? Yes, there are specifications out there. Most of the full-speed (4-bit) spec's are sequestered, so you have to "join their club" in order to get them. Nevertheless, they exist and you can get them. You just have to pay. All in all, I don't think the SD controller alone will buy me any real value, especially in view of volatility of the PC-related market. Maybe not, depending on how much space you need. If you want to acquire and store multiple tens of megabytes per hour ... well, you've got to put the data somewhere, and if your volume is such that you can offload it before the next set of data comes in, a soldered-in SD would be pretty useful. I recently bought a 2GB SD card for $5.95US. with a freight charge of $5.90. Now, they only paid $2.25 or so for freight, so the price was somewhat of a gimmick, but $6 for 2 GB? I'll take that! Re 3: FAT? Why, once the card is soldered in??? I didn't use FAT, though one could, I guess. I could have used SPI, but that's too slow ... JW This must have a niche, since so many people are interested in it. RE |
