Seagate Technology Incorporated

Jpmorgan Chase Bank, as Collateral Agent

Patrick Tai Heng Wong

Wesley Wing Hung Chan

Beng Wee Quak

YongPeng Chng

Yong Peng Chng

Steven Tian Chye Cheok

MingZhong Ding

Bo Wei

Wei Loon Ng

WeiLoon Ng

Ricky Wei Watt Yeo

Aik Chuan Lim

Chew Boon Toh

An aspect of the present disclosure relates to scanning reassigned data storage locations. In one example, a reassignment table is accessed to identify a deallocated data storage location and scan the deallocated data storage location for media defects.

Scanning reassigned data storage locations

A disc drive includes a base and a disc rotatably attached to the base. The disc drive is formatted by obtaining a list of defective sector entries, determining a first location of selected information based on skipping the defective sectors within the list of defective sector entries, and calculating a second location for selected information. At least one sector to skip is added before the second location of selected information to move the selected information from the first position to the second position. The added sectors may be designated as defective sectors. By adding the at least one sector to skip, the second position of the information is moved or slipped.

Disc drive with fake defect entries

A system for adapting head switching sequence in a disc drive includes a method of measuring the time duration for a head switch operation and the time duration of a track switch operation. The system compares the two time durations to determine whether head switching or track switching should be utilized within a zone of tracks on the surface of the data disc. Track switch time durations and head switch time durations may be averaged within a zone and the averages compared to determine whether to use head switching or track switching.

Drive with adaptive data format and head switch sequencing

According to one embodiment of the present invention a disc controller in a disc drive includes a cache memory and a control circuit. The control circuit is configured to identify an operating system of a host computer coupled to the disc drive, select a segmentation level for the cache memory based on the identified operating system, and store information in the cache memory according to the segmentation level. According to another embodiment of the present invention a cache memory in a disc drive is operated by identifying an operating system of a host computer coupled to the disc drive, selecting a segmentation level for the cache memory based on the identified operating system, and storing information in the cache memory according to the segmentation level. The operating system is identified by reading a partition type from a master boot record stored in a disc in the disc drive.

Adaptable cache for disc drive

A method of storing values that involves splitting each value into a n-bit value and an overflow value, and storing, in a main table, the n-bit values in order of increasing magnitude of the values. For each overflow value, the position of the smallest n-bit value is stored in an overflow table. To retrieve a value, the position of the corresponding n-bit value is compared to the positions stored in the overflow value to determine the overflow value of the n-bit value. The actual value is then obtained from the n-bit value and its overflow value.

Method of overflow-based defect management representation

Growing community of inventors

Singapore, Singapore

Patrick Tai Heng Wong