Posted 26 October 2011 - 03:13 PM
Just curious. I keep wondering how Flash Drives store and retrieve data without a physically moving part like the head on and disk of a hard drive ... and when flash drives will replace physically rotating hard drives entirely due to the advantages of no physically moving parts. I understand a little about the possibility of doped semi-conductor layers and diodes creating and capturing a charge (plus or minus being information-equivalent to north or south magnetic polarity), but how are stored charges ("zero or one") "read" in a flash drive?
Someone once mentioned to me that flash drive tech was too expensive to replace everyday PC and Mac hard drives, and at least recently in my experience hard drive storage capacity has outstripped flash drive storage capacity in available products, but my guess is that expense is not the issue now, and that 900GB flash drives (or batteries of flash drives totaling 900GB OR 250GB or whatever) could replace hard drives unless speed of data retrieval becomes longer with that many GB? Just guessing, and doubtful about speed problems.
Or are models now available that use flash drive tech in place of hard drives? Or perhaps the market has not demanded a switch, and there are not enough incentives for computer manufacturers to make such a switch. Laptops with physically rotating hard drives (bang, fall) are not a problem. Or maybe data decay and reliability long term is an issue one way or another.