Flash memory -- sometimes called "Flash ROM" -- is very similar in concept
to the old EEPROM (Electrically Erasable Programmable Read-Only Memory).
  The most obvious practical difference is that the amount of energy needed
to wipe and rewrite an EEPROM was enormous, and was normally available only
in a device specifically constructed for that purpose.
  Flash uses voltage and energy levels that are much lower, and so flash
chips can generally be rewritten *in situ*.

  (Unlike RAM, the contents of flash memories are written in blocks of 4K or
8K.  changing a single character means reading a block into RAM, correcting
it, clearing the block in flash, and then rewriting the block with the
corrected information.)

David Gillett


On 12 May 2004 at 10:31, Roberto Safora Romay wrote:

> In the last times we´ve heard about and used flash memorys, pen drives,
> handy sisks, etc.
> I wonder what kind of memory they use that are able to retain information
> without energy ( apparently at least)
> Also where could i find info on those memorys.
> TIA
> Roberto
>
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