What is Flash Memory and DDR Memory

We know very well that computer has flash memory units working in them. However, what we don’t know is how these memory units function or and their key roles. It becomes quit significant to note here that memory units play their significant role in functioning of computers, laptops, palmtops, notebooks etc. Flash memory and DDR memory are two genres of electronic memories which integrate into the electronic circuits. Flash mem is a specialized unit that is programmable, re-programmable and moreover you can also erase it electronically. This kind of memory is quite effectively used in the gaming consoles as well as different types of memory cards. Flash mem is a non volatile computer mem and it is also quite user friendly. Extensive use of Flash mem can be found in PDAs, digital cameras, audio players, and phones. Another significant point to make here is that since Flash mem is non volatile in nature all the data stored inside it will not be lost until and unless you do not manually erase the data that has been stored in RAM memory. There are two basic forms of Flash mem, viz, NOR and NAND. It is important to point here that NOR has the property to access any type of mem location wit the help of data busses as well as full addresses. NAND Flash mem on the other hand has fast writing ands erase time and these memory units are used in memory cards. Flash mem has its own very limitations and the one of the most known limitation is that flash memory can only be erased and rewritten only for very specific number of times. DDR memory finds its use in the desktop computers. The acronym for memory stands as Double Data Rate and it has significantly developed from SDRAM. DDR is twice faster than the SDRAM memory. DDRs have different variants available in the market, and the quite prominent ones include, DDR1, DDR2 and DDR3. You choice of a particular type of DDR mem would require that you have clear cut idea on the compatibility of your computer system. DDR memories are also quite popular for the fact that they consume less of power than the traditional kinds of SD RAM memories. It is very important that you check on the compatibility of DDR mem should you go for replacement of DDR. Next we jump on to the Compact Flash Card Memory. This type of memory belongs to its own niche and is compatible with several different types of electronic equipment like palmtops and notebooks. You have to be very peculiar in choosing Compact Flash Card Memory, as here again compatibility issue comes to play the role. If size is compared, then CF (CompactFlash) memory cards are big in size than the SD memory cards. Compact flash mem cards come in CF type I and CF type II respectively. With all this information available, you have good reason to go for the type of memory which you want in your computer, laptop or palmtop.