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The type of the memory that is used in the flash drives is the flash memory. The flash memory is a type of chip that is called as the EEPROM. It has the grid that consists of the columns and the rows. It also has a cell. There are two transistors in the cell at each intersection point. The thin oxide layer is responsible for the separation of the two transistors.
The first of the transistors is called as the floating gate. The next or the second transistor is called as the control gate. The only link from the floating gate to the row or the word line is through the other gate that is the control gate. If this is working properly then the cell the value of 1 is there. If the value is to be changed to the 0 then the process known as the tunneling or appropriately known as the Fowler Nordheim tunneling is used. The most useful examples include the following that are listed below: That is these are the things where in you can find the flash memory.
The first one is the BIOS of any computer. The other examples include the compact flash, smartmedia, PCMCIA – used in the solid state disks mostly in the laptops (this is of the type I and also of the type II), the memory stick that is found in the digital cameras etc, USB pen drives and so on. The flash drive is also used in the memory cards of the mobiles etc. The electronic memory is currently available in many forms and many different prices.
The important properties of the flash memory are that it is much fast and very much easier in use. The different types of devices where the services of the flash drive can be utilized also include the computer system. Here the flash drive can be efficiently used for the purpose of data transfer and also for can be used for as if the hard disk drive of any computer is used.
The flash memory is quite expensive as compared to the hard disk drive. But the major advantage of the flash memory over the hard disk is that it is compact and much efficient for the data transfer. The flash memory is also a type of the solid state storage device. That is it means that there are no mobile parts in it. As in the hard disk there are the platters and the read write head moves over it. This is type of mechanism in the hard disk drive is somewhat mechanical in nature but in the consideration with the flash memory this is not the case. There is no such mechanical component in the flash memory drive. Hence it is a purely electronic device.
The other flash types also include the one that is known as the Compact flash card. These compact flash cards were introduced by the Sandisk. This was the case as in the year of 1994. The two things differentiate the compact flash drives from the Smart Media cards: The first one is that they utilize the controller chip in them and the second one is that they are thicker. The Compact flash has small circuit board. This circuit board contains the flash memory chips along with a controller chip. This all is covered in a casing that is much thicker in size than a Smart media card. The concept of the dual voltage is supported by the compact flash. That is they can even operate on a voltage of 3.5 as well as on a voltage of 5 volts.
In comparison to the smart media card the hard casing and the controller chip, its weight and size, all add to the complexity of the compact flash drive. But the storage capacity of the compact flash drive is more then the smart media.
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