High density magnetic recording media

A longitudinal magnetic recording medium comprising at least four magnetic layers comprising:

• a substrate,
• a CoCrTa magnetic intermediate layer on the substrate, wherein the CoCrTa magnetic intermediate layer comprises Cr<16 at % and Ta<6 at %,
• a first CoCrPtB magnetic layer on the CoCrTa layer, wherein the first CoCrPtB magnetic layer comprises Cr:
• 10-14%, Pt:
• 4-8 at %, B:
• 6-10%,
• a second CoCrPtB magnetic layer on the first CoCrPtB magnetic layer, and
• a third CoCrPtB magnetic layer on the second CoCrPtB layer, wherein the third CoCrPtB magnetic layer comprises Cr:
• 12-16 at %, Pt:
• 12-16 at %, B:
• 10-14 at % and has <10 at % Cr than that in the second CoCrPtB magnetic layer, wherein the magnetic intermediate layer has a different composition than that of the first, second and third magnetic layers, wherein the second CoCrPtB magnetic layer comprises Cr:
• 22-26 at %, Pt:
• 11-15 at % and B:
• 4-8 at %.