14076579

Paragraph Number

138

Because, in certain embodiments, the expected balance/bias is known, comparing a read balance/bias relative to the known balance/bias indicates that certain bits which should have satisfied the known balance/bias presently do not, which may be due to a data error or due to changes in the voltage level stored in the storage cells after they were written. In addition, determining that the difference is positive or negative indicates whether the read voltage should be increased or decreased such that a re-read of the data set will result in a read balance/bias that is the same as, or comes closer to the known balance/bias. In one embodiment, the adjustment module 306 adjusts the read voltage level (or another media parameter) in the same direction as the direction of deviation indicated by the DC balance module 404.

Added by DJM 2 2021