Testing method for defect of magnetic disk medium

Abstract

Abstract PURPOSE:To realize a substantial increase of the storage capacity by recording/ reproducing the digital information so as to be tested digitally by a digital testing machine, with regard to only a track in which a defect is detected as a result of an analog test. CONSTITUTION:A tested result of a magnetic disk medium D by an analog testing machine 1 is stored as an analog detection defect data in a storage means 2. Thereafter, in the same magnetic disk medium D, with regard to only a track in which a defect is detected as a result of an analog test, digital information is recorded/reproduced by a digital testing machine 3, and tested digitally. Its result is stored in a storage means 4. This digital test result and the analog test result are matched and collated, and irrespective of a result of the analog test or a result of the digital test, a position which is decided to be a defect is decided to be a true defect part. In such a way, a part which has not appeared as a defect by the digital test although it is decided to be a defect as a result of the analog test can be utilized as a normal storage area, and the storage capacity increases substantially.

Inventors

• 👤 Fumio Shimizu

Bibliographic Details