Marvell International Limited

Agency for Science, Technology and Research

Agency for Science, Technology and Science

Khai Leong Yong

Weiya Xi

Chao Jin

Zhi Yong Ching

Sophia Tan

Shibin Chen

Sufui Sophia Tan

Zhimin Yuan

Bo Liu

Li Wang

Siang Huei Leong

Chun Lian Ong

Jianzhong Shi

Kui Cai

Quan Jiang

Pantelis Sophoclis Alexopoulos

Kheong Sann Chan

Chao Bi

Jing Zhang

Budi Santoso

Qide Zhang

Moulay Rachid Elidrissi

Guchang Han

Chiew Leong Wong

Zhimin He

Jiang Feng Hu

Mengjun Liu

Chun Teck Lim

Tiejun Zhou

Leonard Gonzaga

Sie Yong Law

Ke Gan

Wuzhong Lin

Wee Kiat Lim

Yansheng Ma

Cheng Su Soh

Shengkai Yu

Yin Quan Yu

Kannan Sundaravadivelu

Ningyu Liu

Jianqiang Mou

Boon Long Ibrahim See

Venkataramanan Venkatakrishnan

Bin Meng

Tiong King Ng

Cheng Ann Tan

Cheng Peng Tan

Quanqing Xu

See Kok Koh

Chong Wee Lee

Phyu Hla Nu

Wei Hua

A control module for a multi-level data storage device having a plurality of memory devices is disclosed. The control module may include: an access determination circuit configured to determine that access has been made to a piece of data stored on at least one of the plurality of memory devices, the piece of data associated with a level being one of a first level, a second level, or a third level; a level management circuit configured to change the level from the third level to the second level or from the second level to the first level upon determining that access has been made to the piece of data; and a memory controller configured to promote the piece of data in response to whether the level is the first level, the second level or the third level, wherein at least two levels of the first level, the second level, and the third level are associated with one of the plurality of memory devices.

Control modules, multi-level data storage devices, multi-level data storage methods, and computer readable media

A method for data stripping, allocation and reconstruction in an active drive storage system including a plurality of active object storage devices, each of the plurality of active object storage devices including one or more storage devices and a controller is provided. The method includes the controller of the identified one of the plurality of active object storage devices segmenting the received data into a plurality of data chunks and generating one or more parity chunks in response to the plurality of data chunks. The method further includes the controller of the identified one of the plurality of active object storage devices reorganizing the plurality of data chunks and the one or more parity chunks in response to a number of the plurality of data chunks and a number of the one or more of the plurality of active object storage devices into which the received data is to be stored. Finally, the method includes the step of the controller of the identified one of the plurality of active object storage devices storing the plurality of data chunks and the one or more parity chunks into the one or more of the plurality of active object storage devices.

Data stripping, allocation and reconstruction

A method for defining an erasure code for system having a predetermined number of data disks is disclosed. The method includes selecting step, constructing step, determining step and repeating step. The selecting step includes selecting a predetermined acceptable number of failures for the system. The constructing step includes constructing a first Tanner graph for two failures acceptable system having predetermined number of data disks. The determining step includes determining erasure code from the first Tanner graph. The repeating step includes repeating the constructing step and the determining step by increasing the acceptable number of failures by one and constructing another Tanner graph in response to the increased acceptable number of failures by increasing number of parity nodes until the predetermined number of failures for the system is reached.

Method of constructing flat XOR codes from integer indexed tanner graphs

A data storage device includes a data storage medium having a plurality of data blocks. A cache includes a plurality of cache blocks. Each cache block includes a corresponding cache block address. A metadata table includes a plurality of table entries for the data blocks, respectively. Each of the table entries is configured to store the cache block address of one of the cache blocks in which data of a corresponding one of the data blocks is written. A bitmap is configured to store statuses of all of the cache blocks, respectively.

Systems and methods for managing cache of a data storage device

A data storage device includes a data storage medium, a cache, and a cache control memory. The data storage medium has M data blocks. M is an integer greater than 1. The cache includes N cache blocks having N cache block addresses, respectively. N is an integer greater than 1. The cache control memory includes M memory elements corresponding to the M data blocks, respectively. The cache control memory is configured to, in response to a request to cache data of one of the M data blocks: (a) write the data from the one of the M data blocks to one of the N cache blocks; and (b) write, in the one of the M memory elements corresponding to the one of the M data blocks, one of the N cache block addresses corresponding to the one of the N cache blocks where the data is written.

In various embodiments, a data storage system may be provided. The data storage system may include a storage. The storage may include a first portion and a second portion. The data storage system may further include a determination circuit configured to determine whether to write data to the first portion or to the second portion. The data storage system may also include a control circuit configured to control writing the data to the first portion in a log structured manner.

Data storage system, method of writing to storage in the data storage system, hard disk and method of forming the hard disk

A data storage device is provided. The data storage device includes a data storage medium having a plurality of data blocks, a cache having a plurality of cache blocks, wherein each cache block is identified by a cache block address, a cache control memory including a memory element for each data block configured to store the cache block address of the cache block in which data of the data block is written.

Data storage device and method of managing a cache in a data storage device

According to various embodiments, a storage controller configured to control storage of data in a pre-determined area of a storage medium may be provided. The storage controller may include a memory configured to store a write pointer, a reclaim pointer, and a wrapped around pointer. The write pointer may indicate a location of the storage medium to write incoming data. The reclaim pointer may indicate a location of the storage medium to perform a space reclamation. The wrapped around pointer may indicate a location of the storage medium where writing is to continue if writing of data reaches an end of the pre-determined area.

Storage controllers and storage control methods

According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.

Data storage device

A data transportation protocol () for transferring data within a wireless network (), the protocol () comprising: a block I/O interface layer () to provide a single level of translation between block I/O storage protocol commands and network packets; and a wireless transport layer () to transport the network packets between a client (A) and server (B) within the network (); wherein the block I/O interface layer () performs operations directly on a storage device driver () and a network device driver () of the client (A) and server (B).

Wireless transportation protocol

Growing community of inventors

Singapore, Singapore

Khai Leong Yong