With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Seth MacFarlane co-created the TV series "American Dad!" in 2004.
text_B: Memory refresh is the process of periodically reading information from an area of computer memory and immediately rewriting the read information to the same area without modification , for the purpose of preserving the information .. computer memory. computer memory. Memory refresh is a background maintenance process required during the operation of semiconductor dynamic random-access memory -LRB- DRAM -RRB- , the most widely used type of computer memory , and in fact is the defining characteristic of this class of memory .. computer memory. computer memory. dynamic random-access memory. dynamic random-access memory. In a DRAM chip , each bit of memory data is stored as the presence or absence of an electric charge on a small capacitor on the chip .. bit. binary digit. electric charge. electric charge. capacitor. capacitor. As time passes , the charges in the memory cells leak away , so without being refreshed the stored data would eventually be lost .. To prevent this , external circuitry periodically reads each cell and rewrites it , restoring the charge on the capacitor to its original level .. capacitor. capacitor. Each memory refresh cycle refreshes a succeeding area of memory cells , thus repeatedly refreshing all the cells in a consecutive cycle .. This process is conducted automatically , in the background , by the memory circuitry , while the computer is on , and is transparent to the user .. While a refresh cycle is occurring the memory is not available for normal read and write operations , but in modern memory this `` overhead '' time is not large enough to significantly slow down memory operation .. Electronic memory that does not require refreshing is available , called static random-access memory -LRB- SRAM -RRB- .. static random-access memory. static random-access memory. SRAM circuits require more area , because an SRAM memory cell requires four to six transistors , compared to a single transistor and a capacitor for DRAM .. capacitor. capacitor. transistor. transistor. As a result , data density is much lower in SRAM than in DRAM , and SRAM has higher price per bit .. bit. binary digit. Therefore , DRAM is used for the main memory in computers , video game consoles , graphics cards and applications requiring large capacities and low cost .. The need for memory refresh makes DRAM timing significantly more complicated than SRAM circuits , but the density and cost advantages of DRAM justify this complexity .
not_related.