W dniu 2013-03-04 18:08, Jonathan Goossen pisze:
I did some research a while back to familiarize myself with the
technology. There are two types of flash memory. Static and dynamic.
Static has a limited number of writes, but can retain the data for years
without power. Dynamic has a ware limit more like hard disks, but requires
power for the cells to hold the data.
IMHO, no.
Flash memory is flash memory. It's always "static".
RAM is dynamic or static. Mainframe central memory, RAM in your laptop
or PC desktop, or RAM in Wintel server - this is always DRAM. SRAM is
faster, but it's not widely used because of other reasons like price,
density, etc.
Flash is very special kind of EEPROM, relatively quick, subject to wear,
etc. Good for keeping config settings, files, photograpies, etc.
Because of wera it's not good for db activity (many writes, very
unevenly spreaded).
Flash is used for BIOS in PC motherboards, memory sticks, CF, SD, MMC,
xD, SD, MS cards widely used in photocameras, mobile phones, etc.
Flash is also used in SSD, but contrary to the above applications, SSD
require more sophisticated design - to avoid uneven memory cell wearing,
to replace failing cells and to provide disk-like interface.
BTW: there are also niche "SSD disks" built on DRAM. Limited capacity,
extremely high prices. Usually equipped with battery, there were
versions with battery and regular HDD to dump RAM content.
See: Texas Memory Inc (recently bought by IBM), RAMSAN
BTW2: there are two (or three) flavors of modern flash: MLC, SLC and
TLC. What's funny the eldest type SLC is also the most reliable, but the
capacity and price are the worst.
--
Radoslaw Skorupka
Lodz, Poland
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