Streamline your patent due diligence with deep analytics for patents, inventors, and attorneys

Compare patents by technology sector

Deep Analytics

Quickly evaluate patents of interest

► Want to see more? Join for free!

PatentQuant Patent Profile
Generated January 20, 2018

Disk drive allocating cache segments by mapping bits of a command size into corresponding segment pools

Patent Number: 6,845,427

Patent Information

A disk drive is disclosed comprising a semiconductor memory comprising a cache buffer having a plurality of segment pools, each segment pool comprising a plurality of cache segments, and each cache segment comprises 2k number of blocks where k is a predetermined integer for each segment pool. Host commands have a command size comprising a plurality of bits indicating a number of blocks of data associated with the host command. Each bit of the command size is mapped to a corresponding segment pool in order to allocate cache segments for the host commands.
Patent Number: 6,845,427
Issue Date: 2005-01-18

Primary Category

Biographical Information

Executive Summary


This patent was granted in ► Log In, which is ► Log In speed.

It has ► Log In claims, which is ► Log In than average for this category.

Its proximity to basic research is ► Log In than others in this category, and it displays ► Log In technology cycle time.

This patent received ► Log In citations from other patents, and references ► Log In other patents, as compared to other patents in this category.

Grant Time

► Log In


► Log In

► Want to see more? Join for free!

PatentStat Scores in Not categorized
These scores show the percentile ranks for each metric.
For example, a score of 90 means that 90% of similar patents had lower scores.

Patent Grant Time

This patent had ► Log In grant time compared to others in this category.

Patent grant time can be influenced by many factors. Activities within the USPTO that are beyond the control of patent attornies can influence grant time, but short grant times can also indicate well-written patents and dedicated efforts to respond rapidly to USPTO office actions with strong arguments. Shorter grant times are preferable, and the scores for this section are inverse measures — higher scores are better.

Patent Claims

This patent has ► Log In claims compared to others in this category.

The number of claims in a patent is correlated with its strength. Because greater claim counts increase the cost of a patent, more claims can indicate the importance an applicant assigns to a patent. Importantly, some may elect to file claims across multiple patents. A higher score in this metric indicates more claims, relative to others in this category.

Citations From Other Patents

This patent has received ► Log In citations from other patents, than others in this category.

Citations from other patents are an important measure of the significance of a patent. More citations indicate that other technologies build on a patent. Higher scores in this metric are better, and indicate more citations from other patents.

Citations to Other Patents

This patent referenced ► Log In citations to other patents, than others in this category.

A lower number of citations to other patents can be a sign of diminished patent strength. More citations indicate dependence on more other technologies. Higher scores in this category are better, and indicate fewer citations to other patents.

Research and Innovation Indicators
These are percentile ranks — they indicate the percentage of peers with lower scores.

Proximity to Basic Research

► Log In


Proximity to Basic Research

This patent has ► Log In proximity to basic research compared to others in this category.

Proximity to basic research is measured by comparing the number of citations to non-patent literature among a cohort of patents. Because most non-patent citations are primary research papers, a higher count indicates greater proximity to basic research.

► Want to see more? Join for free!


Patents cited by this patent

Patent Title
6,711,635 Disk drive employing thresholds for cache memory allocation
6,704,839 Data storage system and method of storing data
6,473,830 System and method for organizing data stored in a log structured array
6,470,423 Managing partitioned cache
6,442,661 Self-tuning memory management for computer systems
6,336,164 Method and system for preventing deadlock in a log structured array
5,966,726 Disk drive with adaptively segmented cache
5,890,211 Disk drive with cache controlled adaptively for amount of prefetch

Patents that cite this patent

Patent Title
9,330,715 Mapping of shingled magnetic recording media
9,323,685 Data storage space processing method and processing system, and data storage server
9,318,137 Data storage device executing retry operation by buffering signal samples at different radial offsets
9,311,939 Write-through media caching
9,299,371 Disk drive slider with sense amplifier for coupling to a preamp through a supply/bias line and a read signal line
9,281,009 Data storage device employing variable size interleave written track segments
9,269,393 Electronic system with data refresh mechanism and method of operation thereof
9,268,649 Disk drive with recent write streams list for data refresh determination
9,268,499 Hybrid drive migrating high workload data from disk to non-volatile semiconductor memory
9,263,088 Data management for a data storage device using a last resort zone
9,257,146 Data storage device comprising sequence detector compensating for inter-track interference
9,257,145 Disk drive measuring down-track spacing of read sensors
9,257,143 Precautionary measures for data storage device environmental conditions
9,251,856 Read failover method and apparatus for a data storage system
9,251,844 Waterfall method and apparatus for a data storage device read system
9,245,558 Electronic system with data management mechanism and method of operation thereof
9,245,556 Disk drive employing multiple read elements to increase radial band for two-dimensional magnetic recording
9,236,086 Methods for reducing operational latency of data storage systems
9,230,605 Data storage device maximizing areal density based on a target quality metric
9,230,585 Per wedge preheat DFH to improve data storage device performance
9,214,186 Data storage device measuring radial offset between read element and write element
9,213,493 Sorted serpentine mapping for storage drives
9,196,302 Electronic system with media maintenance mechanism and method of operation thereof
9,189,392 Opportunistic defragmentation during garbage collection
9,183,877 Data storage device comprising two-dimensional data dependent noise whitening filters for two-dimensional recording
9,183,864 Disk drive adjusting closed-loop fly height target based on change in open-loop fly height control signal
9,171,575 Data storage device detecting media defects by writing opposite polarity test pattern
9,164,694 Data storage device detecting read-before-write conditions and returning configurable return data
9,158,722 Data storage device to communicate with a host in a SATA or a USB mode
9,153,287 Data access for shingled magnetic recording media
9,153,266 Data storage device measuring laser protrusion fly height profile
9,135,205 Data storage assembly for archive cold storage
9,129,628 Data management for data storage device with different track density regions
9,128,820 File management among different zones of storage media
9,123,382 Non-volatile caching for sequence of data
9,123,370 Data storage device calibrating fly height actuator based on laser power for heat assisted magnetic recording
9,117,489 Data storage device screening heads by verifying defects after defect scan
9,117,479 Data storage device calibrating laser write power for heat assisted magnetic recording
9,117,463 Data storage device erasing multiple adjacent data tracks to recover from inter-track interference
9,099,144 Disk drive evaluating laser performance for heat assisted magnetic recording
9,099,134 Data storage device employing multiple jog profiles for a butterfly written disk surface
9,099,103 Heat assisted magnetic recording withinterlaced high-power heated and low-power heated tracks
9,082,458 Data storage device balancing and maximizing quality metric when configuring arial density of each disk surface
9,076,474 Data storage device attenuating thermal decay effect on fly height measurement
9,075,714 Electronic system with data management mechanism and method of operation thereof
9,074,941 Systems and methods for measuring ambient and laser temperature in heat assisted magnetic recording
9,070,406 Disk drive configuring one-dimensional and two-dimensional recording areas based on read element spacing
9,064,542 Scheduled load of heads to reduce lubricant migration on pole tip and decrease time to ready
9,064,525 Disk drive comprising laser transmission line optimized for heat assisted magnetic recording
9,064,504 Electronic system with media recovery mechanism and method of operation thereof
9,063,838 Data storage device shifting data chunks of alignment zone relative to sector boundaries
9,060,420 Method of manufacturing a double sided flex circuit for a disk drive wherein a first side lead provides an etching mask for a second side lead
9,053,749 Disk drive comprising a per-drive and per-head fly height filter
9,053,730 Disk drive comprising extended range head proximity sensor
9,049,471 Personal video recorder for inserting a stored advertisement into a displayed broadcast stream
9,047,917 Disk drive slider with sense amplifier for coupling to a preamp through a supply/bias line and a read signal line
9,025,421 Data storage device adjusting laser input power to compensate for temperature variations
9,025,270 Electronic system with current conservation mechanism and method of operation thereof
9,025,267 Data storage device using branch metric from adjacent track to compensate for inter-track interference
9,021,410 Electronic system with multi-cycle simulation coverage mechanism and method of operation thereof
9,013,821 Data storage device employing one-dimensional and two-dimensional channels
9,013,818 Disk drive measuring reader/writer gap by measuring fractional clock cycle over disk radius
9,009,358 Configuring a data storage device with a parameter file interlocked with configuration code
9,001,453 Data storage device calibrating fly height actuator based on read mode touchdown resistance of touchdown sensor
8,996,839 Data storage device aligning partition to boundary of sector when partition offset correlates with offset of write commands
8,990,493 Method and apparatus for performing force unit access writes on a disk
8,988,810 Track measurement for data storage device
8,988,809 Disk recording device for writing a radially coherent reference band by measuring relative timing offsets of reference bursts
8,976,633 Data storage device calibrating fly height actuator based on laser power for heat assisted magnetic recording
8,970,978 Disk drive detecting head touchdown by applying DC+AC control signal to fly height actuator
8,959,281 Data management for a storage device
8,958,167 Detection of disk surface irregularities in data storage devices
8,954,664 Writing metadata files on a disk
8,953,277 Data storage device writing tracks on a disk with equal spacing
8,953,269 Management of data objects in a data object zone
8,949,521 Actuator prepositioning for disk drive
8,947,812 Data storage device comprising equalizer filter and inter-track interference filter
8,941,941 Disk drive calibrating touchdown sensor
8,937,782 Hard disk drive assembly including a NVSM to store configuration data for controlling disk drive operations
8,922,939 Disk drive generating feed-forward fly height control based on temperature sensitive fly height sensor
8,914,625 Automatically configuring a web browser file when booting an operating system from a data storage device
8,909,889 Method and apparatus for servicing host commands by a disk drive
8,908,311 Data storage device writing a multi-sector codeword in segments over multiple disk revolutions
8,902,529 Dual frequency crystal oscillator
8,902,527 Systems and methods for improving sequential data rate performance using sorted data zones
8,898,423 High performance caching architecture for data storage systems
8,891,341 Energy assisted magnetic recording disk drive using modulated laser light
8,891,193 Disk drive calibrating threshold and gain of touchdown sensor
8,879,188 Disk drive employing fly height calibration tracks to account for magnetic entropy and thermal decay

► Want to see more? Join for free!

Information presented on this site is collected from the USPTO and other sources. Errors may have been introduced in the original assembly or analysis of the data.
No warranties are expressed or implied.The content of this site is not a substitute for skilled legal, financial, or other guidance.
Copyright thinkBiotech LLC. All rights reserved.
Privacy policy.