A flash memory controller comprises a flash memory interface controller, a host interface controller, a random-access memory interface controller, an ECC encoder, an ECC divider, an ECC constructor and an ECC decoder. The invention also provides methods of fabricating magnetic tunnel junction memory elements as well as magnetoresistive memory devices and processor systems comprising such memory elements. As the user attempts to give effect to any operator instructions, feedback is provided to the operator on the progress made by the user in attempting to implement those instructions. The spiro derivative according to the present invention has the chemical structure, for example, represented by the following Formula : . The process oil composition for elastomers is a mixture of a purified mineral oil and a synthetic oil obtained by polymerizing olefinic monomer, wherein the ratio of the purified mineral oil to the synthetic oil is preferably 4060 to 8020. The cap can be removed and the seal can be replaced without extensive disassembly of the valve, thereby eliminating the requirement of re-calibration after a repair has been made.