magnetic ram and multi state memory in which each memory cell has more than two states the dvd pcb 419 includes a power supply 430 that provides power to the components of the dvd drive 418 the dvda 420 may include a preamplifier device 431 a laser driver 432 and an optical device 433 which may be an optical read write orw device or an optical read only or device a spindle motor 434 rotates an optical storage medium 435 and a feed motor 436 actuates the optical device 433 relative to the optical storage medium 435 when reading data from the optical storage medium 435 the laser driver provides a read power to the optical device 433 the optical device 433 detects data from the optical storage medium 435 and transmits the data to the preamplifier device 431 the analog front end module 426 receives data from the preamplifier device 431 and performs such functions as filtering and a d conversion to write to the optical storage medium 435 the write strategy module 427 transmits power level and timing data to the laser driver 432 the laser driver 432 controls the optical device 433 to write data to the optical storage medium 435 referring now to fig1 c the teachings of the disclosure can be implemented to write and read back pilots to memory 441 of a high definition television.