Hgst Netherlands, B.v.

Sandisk Technologies Inc.

Kei Akiyama

Martin Aureliano Hassner

Jonathan Darrel Coker

Tai-Yuan Tseng

Roger William Wood

Kirk Hwang

Sridhar Chatradhi

Iris Lu

Yasuhiro Takase

Yoshito Katano

Noritoshi Shinto

An apparatus is provided that includes a memory structure including non-volatile memory cells, a first processor and a second processor. The first processor is configured to provide a plurality of sets of commands to a second processor to perform memory operations on the non-volatile memory cells. The second processor is configured to execute the sets of commands and provide a control signal to the first processor. The first processor is further configured to provide the sets of commands to the second processor based on a status of the control signal. The second processor is further configured to control the status of the control signal so that the second processor executes sets of commands with no idle time between consecutive sets of commands.

Apparatus and methods for back-to-back state machine controller bus operations

A technique for recovering of 'squeezed' sectors in a set of sequential sectors such as are used in Shingled Magnetic Recording (SMR) is described. Embodiments of the invention use a programmable erased sector recovery scheme, which is a concatenation of a 'Cauchy-type' track erasure correction code, together with a media-error correction code that generates N-weighted parity-sectors per track and is capable of replacing up to N-erased sectors per track in any possible combination.

Scalable repair block error correction for sequential multiple data blocks in a magnetic data storage device

A disk drive for encrypting user data. A motor configured to rotate a disk which stores encoded user data and an encryption flag which has not been encoded. An encoder/decoder processor configured to encode the user data that is written into the disk without encoding the encryption flag, and decodes the user data that is read out from the disk without decoding the encryption flag that is read out from the disk. An encryption processor configured to encrypt the user data at the encryption flag, wherein the encryption flag indicates encryption before the encoder/decoder processor starts encoding, and wherein the encryption processor obtains an encryption flag read out from the disk before the encoder/decoder processor completes decoding of the user data read out from the disk, commencing decryption of decoded data where the encryption flag indicates encryption before decoding of the user data is complete.

Disk drive and method for data conversion process in a disk drive

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Yokohama, Japan

Kei Akiyama