Quote:
Originally Posted by JSWolf
if you do not have need for the SD card because all of your content currently fits into the internal memory, then what you will be saving is battery life between charges. The SD card does take battery to use.
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Note that I said "The internal flash is probably faster and more energy efficient than the SD card. (Probably. I have no data.)" If you have hard data from Ectaco, or current consumption measurements that you have taken on an actual Jetbook, please share.
Not knowing the read current of either the internal flash or the SD card (which probably varies by brand), it would be difficult to make a blanket statement. If all of the ebooks are on the SD card, then the internal flash is not being read and would most likely only be drawing a minimal standby/sleep current. We just don't have enough information on the actual parts and design used in this particular reader to know for sure.
Having said that, I doubt that the additional current draw of an SD card would affect the battery life significantly (my opinion at this point). I may do a test with my Jetbook to determine if it matters or not. If I do, I'll certainly report my findings.
The situation may be different with eInk devices. Since they don't draw as much current continuously, the additional current draw of an SD card may be a more significant percentage of the whole. I have no hard data, so this is just speculation, based on my knowledge of electronics.