Patent ID: 7252897
Filing Date: 2007-08-07
Classification: G11B

Abstract:
1. A magnetic recording disk comprising a substrate, a magnetic layer formed on the substrate, a protective layer formed on the magnetic layer and a two part lubricant layer formed on the protective layer, a first lubricant layer containing a perfluoropolyether compound having an end moiety containing a hydroxyl group on the protective layer side and a second lubricant layer containing a perfluoropolyether compound having an end moiety containing a phosphazene ring on the first lubricant layer, wherein said perfluoropolyether compound having an end moiety containing a hydroxyl group is a compound having a structure of the general formula (IV), wherein each of r and s is an integer of 1 or greater, and said perfluoropolyether compound having an end moiety containing a phosphazene ring is a compound having a structure of the general formula (I), wherein R R