Plattenförmiges magnetisches Aufzeichnungsmedium

摘要

The present invention provides a disc magnetic recording medium which provides remarkable improvements in electromagnetic characteristics, particularly high density recording properties, and exhibits excellent magnetic properties with various sizes. A disc type magnetic recording medium is disclosed, comprising a substantially non-magnetic layer and a magnetic layer provided on a non-magnetic support in this order, said magnetic layer comprising a ferromagnetic metal fine powder or ferromagnetic hexagonal ferrite fine powder dispersed in a binder, wherein said non-magnetic support is an aramide or polyethylene naphthalate having a central plane average surface roughness SRa of not more than 10 mm and there is the following relationship between the thickness d ( mu m) of the non-magnetic support and the outermost diameter D (mm) of the recording area: $$ $ \mathop{\mathrm{image}}$$$