When you study the laptop RAM difference you will appreciate that these are different for each of the RAM types and hence they are not compatible with each other and hence they cannot be mix and matched. RAM provides the facility to store the data both before and after processing on a temporary basis and is now available in different versions and speeds to match the performance specifications of the present day laptop computers.

The present day RAM is built on the Synchronous Dynamic Random Access Memory using the Double Data Rate specifications and hence they are called as SDRAM of DDR1, DDR2, or DDR3 versions. They work on the basis of double pumping, dual pumping or double transition process. They are able to provide two data transfer for each clock cycle.

The first in the category of RAM is the DDR or DDR1 RAM and it belongs to the first generation in the SDRAM technological evolution. It is characterized by enhanced prefetching, strobe based data bus, double transition clocking, low voltage signalling, Stub- series Terminated logic-2 etc. Comes with 184 pins and works at the highest voltage range.

DDR2 RAM is the successor of DDR1 and gives a data transfer rates of up to 6.4 GB per second and works at a lower voltage, and gives much improved performance than the DDR1 due to the faster clocks, low voltage ( 1.8 volts) operation, with a simplified command set is able to give better performance than the DDR1

While learning the laptop RAM difference you will find that the DDR3 belongs to the latest third generation of laptop RAM and is a further improved version over DDR2 as it has more improved data transfer bandwidth and still lower power consumption. The DDR3 RAM is designed to operate at 400MHz to 1066 MHz and can transfer from 6.40GB to 17 GB per second. DDR3 RAM design gives chip capacities of 512 MB to 16 GB.

Due to the continuous evolution and advancements in the computer memory technology the DDR1 has become obsolete and they are not mass produced anymore. Due to better performance and streamlined operation and compact size DDR2 and DDR3 are more preferred for use in the present days.

How hard disk works
The Hard Disk is the place in your computer where data is stored long term. The name 'hard disk' was adopted to differentiate it from the 'floppy disk' (which in the early days really was floppy!).

The hard disk in the pictures below has had the casing removed so you can see inside. The hard disk pictured is a Hewlett Packard with a storage capacity of 340Mb which was probably state of the art around 1992 / 93.

Today's typical hard disk has a storage capacity of 500Gb - that's well more than 1500 times more storage than back in 1992/93.

The interesting thing is that the physical dimensions have not changed despite the overwhelming increase in storage.

What you can just see in the pictures to the above are two shiny discs (called "platters"), one sitting on top of the other. Hard disks may have two or more shiny discs (referred to as "platters"). The device that sits above the disk is the arm, on the tip of which is an electronic device that can either impart or receive electrical charges to and from the magnetic surface of the disk. Since there are two platters in this hard disk, there are in fact two arms (one for each platter).

When in operation the arm moves across the surface extremely fast. It works so hard that eventually, probably between 3-5 years it begins to malfunction and cause micro damage to the surface of the disks. Then your hard disk begins to report "bad sectors".

Hard drives for laptop computers are much smaller and moe susceptible to damage due to the nature of laptops and notebook computers being frequently moved around. Vibration caused while the computer is actually in operation is not good for the hard disk. Therefore shutdown your laptops before you move them.

CPU-Z is a freeware system profiling and monitoring application for Microsoft Windows and Android that detects the central processing unit, RAM, motherboard chipset, and other hardware features of a modern personal computer or Android device.

For android phones 😃

Why Netflix Doesn’t Care If You Share Your Account
https://www.howtogeek.com/413360/why-netflix-doesnt-care-if-you-share-your-account/

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