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SSD  :- A solid-state driveis a data storage device using integrated circuit assemblies as memory to store data persistently. SSD technology uses electronic interfaces compatible with traditional block input/output (I/O) hard disk drives, thus permitting simple replacement in common applications. SSDs have no moving (mechanical) components. This distinguishes them from traditional electromechanical magnetic disks such as hard disk drives (HDDs) or floppy disks, which contain spinning disks and movable read/write heads. SSDs are still roughly seven to eight times more expensive per unit of storage than HDDs. SSDs use NAND-based flash memory, which retains data without power. SSD includes a controller that incorporates the electronics that bridge the NAND memory components to the host computer. SSDs have no moving parts and therefore are basically silent, although electric noise from the circuits may occur. Susceptibility to environmental factors-No moving ...

The limitations of cookies :- 1) the cokkie specification says that  I) no cookie can exceed 4KB in size, II) only 20 cookies are allowed per domain , III) and a total of 300 cookies can be stored on the client side 2) There is no control over when the browsers actually expire cookies. Type juggling :- 1) The conversion of a value from one type to another is called casting. 2) This kind of implicit casting is called type juggling in PHP. Regular expressions:- 1) Definition :- A regular expression is a string that represents a pattern .The regular expression functions compare that pattern to another string and see if any of the string matches the pattern .Some functions tell you whether there was a match, while others make changes to the string. 2) PHP provides support for two different types of regular expressions : 1) POSIX and  2) Perl- compatible 3) POSIX regular expressions are less powerful and sometimes slower , than the Perl - compatible ...