Abstract: A system and method of model-based estimating comprising: receiving a master estimate, including a plurality of master subitem estimates; generating a model estimate, including a plurality of model subitem estimates; generating a subjectives estimate, including a plurality of subjectives subitem estimates; receiving a model update; determining which of said model subitem estimates and said subjectives subitem estimates is impacted by said model update; determining one or more cost updates to said model subitem estimates and said subjectives subitem estimates; updating at least one of said model subitem estimates and said subjectives subitem estimate, based at least in part upon said step of determining one or more cost updates to said model subitem estimates and said subjectives subitem estimates.

Abstract: A magnetic recording disk with a glass substrate is textured by a process which creates an array of bumps in a magnetic head contact start and stop (CSS) region of the disk. The texturing process uses a laser to provide pulses of predetermined energy fluence on the glass substrate to produce a plurality of raised bumps in the substrate surface, each bump having a surface elevation controllable to within a few nanometers. The bumps are created without unwanted micro-cracking or ejection of surface material by exploiting a narrow operating region below the abrupt thermal shock fluence threshold of the glass substrate. This textured glass substrate provides the magnetic recording disk with improved stiction, wear, coatability and sensor flying height properties.