SUMMARY OF THE INVENTION  BACKGROUND OF THE INVENTION  FIELD OF THE INVENTION  MAGNETIC RECORDING MEDIUM  For the coexistence with an  ME  tape, an  MP  tape must  have higher output by thinning the magnetic layer, same as  an  ME  tape, and also it is necessary that the relationship  between the recording current and the reproduction output of  an  MP  tape should be the same with that of an  ME  tape. If  the recording current of an  MP is  increased gradually, the  The above object of the present invention has been  achieved by a magnetic recording medium which (is a  magnetic recording particulate medium and) comprises a  support having thereon a magnetic layer comprising a fer› romagnetic metal powder dispersed in a binder resin,  An object of the present invention is to provide a magnetic  recording particulate medium excellent in electromagnetic  characteristics, in particular, to provide a magnetic recording  medium as a tape for  DVC  used for digital recording which  is well balanced in input/output characteristics and over› writing characteristics to have interchangeability with an  ME tape, has high output and is excellent in overwriting  characteristics.  Further, as a video tape used for a magnetic tape cassette  of Hi-8 or digital VCR for consumer use (SD specification)  which is hereinafter referred to as DVC, a tape of magnetic  recording metal-film medium in which a magnetic recording 55  layer comprises a vaccum deposited metal (alloy), i.e., an  ME (metal-evaporated) tape, has been nowadays put to  practical use, and a system of using a magnetic recording  particulate tape using a ferromagnetic metal powder, i.e., an  MP  (metal particulate) tape, and an  ME  tape concurrently  60  has been realized.  For improving electromagnetic characteristics of a mag› netic recording particulate medium, various methods such as  means of improving magnetic characteristics of ferromag› netic powders or surface smoothness of magnetic layer have  been suggested but these are not sufficiently satisfactory in  view of higher density recording. Further, recording wave› length shows a tendency to become shorter with the progress  of high density recording of a magnetic recording medium  in recent years. The self demagnetization loss at recording  time, i.e., output decreases due to increase of magnetic layer  thickness, and the thickness loss at the time of reproduction  have become serious problems. Therefore, a magnetic  recording particulate medium comprising an extremely thin  layer is proposed.  As a means for ensuring magnetization amount when a  magnetic layer is extremely thin, there is a method of using  a ferromagnetic powder having high saturation magnetiza› tion  as  and a method of decreasing the amount of a binder  resin or the amount of nonmagnetic powders, such as an  abrasive, etc. However, the dispersibility of a magnetic  ( coating) solution is reduced, the surface properties of a  magnetic layer are degraded, or the strength of a magnetic  layer becomes insufficient. As a result, running durability is  extremely reduced.  For reducing an overwriting erasure factor, it has been  thought that lowering the coercive force  He  of a magnetic  layer would be sufficient. However, by the reduction of the  coercive force He, an overwriting erasure factor can be  improved but there is a limit because high frequency output  is reduced due to recording demagnetization. Further, it has  been suggested that the thickness of a magnetic layer be  decreased for reducing an overwriting erasure factor.  However, too thin a layer causes deficiency of magnetization  amount. As a result output is entirely decreased whether it is  short wave or long wave. Therefore, this can be limiting.  As magnetic recording particulate media, those compris› ing a support having coated thereon a magnetic layer com› prising a ferromagnetic powder, e.g., ferromagnetic iron  oxide, Co-modified ferromagnetic iron oxide, CrO$_{2}$ ,  ferro› magnetic metal (including alloys), etc., dispersed in a binder  have been generally used.  Further, a signal of recording wavelength of 22  µm  has  been adopted as a synchronizing signal and a signal of  recording wavelength of 0.488  µm  has been adopted as a  data signal in a digital video cassette recorder for consumer  use.  An overwriting erasure omitting an erasure head has  been employed for the sake of making a recorder light- weight. For adopting overwriting erasure, a synchronizing  signal is necessary to be erased by a data signal and the  overwriting erasure factor is said to be preferably -20 dB or  less.  It is desired that an overwriting erasure factor be as low  as possible as an essential characteristic for a magnetic  recording medium.  Regarding the demand for higher density recording, a  magnetic recording particulate medium formed by coating a  dispersion of a ferromagnetic powder in a binder on a  support has been inferior to a magnetic recording metal-film  medium (metal-evaporated) in electromagnetic characteris› tics due to low packing density of a ferromagnetic powder.  However, with the improvement of the performance of  ferromagnetic powders and the advancement of the coating  technique of an extremely thin layer in recent years, almost  the same level of electromagnetic characteristics with those  of the metal-film medium have been achieved. Further, a  magnetic recording paticulate medium is superior in pro› ductivity and corrosion resistance.  Magnetic recording media are widely used as audio tapes,  video tapes, computer tapes, computer discs and the like. A  magnetic recording medium has become generally higher in  density. The recording wavelength has become shorter and  recording systems from an analog system to a digital system  have been discussed.  reproduction output thereof decreases due to recording  demagnetization, but an  ME  tape does not have such a  tendency and if the recording current is increased, the  reproduction output tends to be saturated. Therefore, an  Hi-8  deck takes the dual system of recording respectively with  different recording currents for  MP  and  ME  tapes in practice,  which complicates the circuit. For resolving this problem, it  is necessary for the system to be capable of common use of  an MP tape and an ME tape and recording is performed with  the same recording current. However, there is a problem  such that when an MP tape is recorded/reproduced with the  optimal recording current of an ME tape, the output is  lowered. On the other hand, when an ME tape is recorded/  reproduced with the optimal recording current of an  MP  tape, an  ME  tape cannot exhibit its capability and the output  is lowered. Accordingly, it has been necessary to make the  optimal recording current of an  MP  tape almost equal to that  of an  ME  tape.  The present invention relates to a magnetic recording  medium, in particular, the present invention relates to a  magnetic recording particulate medium suitable for high  density (high capacity) recording and reproducing of digital  signals.  1  US 6,203,934  Bl  2 