An apparatus for processing signals, in particular physiological measuring signals, is provided with a number of channels with main signal inputs for receiving input signals. These biomarkers include urine precursor alpha-2-HS-glycoprotein, urine alpha-1 antitrypsin, urine alpha-1 acid glycoprotein, urine osteopontin, serum osteopontin, their fragments, and combinations thereof. Accordingly, file extent information can be prevented from excessively increasing by maximally preventing a recording area from being scattered, when some of a data file are deleted by a user’s request. The conductive interconnect includes ground conductors and digital signal conductors.