Patents by Inventor Cyril Guyot

Cyril Guyot has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20130194864
    Abstract: A method and apparatus are provided for implementing enhanced performance for multi-level cell (MLC) memory using threshold-voltage-drift or resistance-drift tolerant moving baseline memory data encoding. A voltage baseline of a prior write is identified, and a data write uses the threshold-voltage-drift or resistance-drift tolerant moving baseline memory data encoding for data being written to the MLC memory responsive to the identified voltage baseline.
    Type: Application
    Filed: January 30, 2012
    Publication date: August 1, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Zvonimir Z. Bandic, Luiz M. Franca-Neto, Cyril Guyot, Robert Eugeniu Mateescu
  • Publication number: 20130142024
    Abstract: A method is described for allowing disk drives, such as shingle-written magnetic recording (SMR) drives, to be shipped for customer use with portions of the magnetic media being left untested. The testing is then completed by the drive self-testing in the field. The drive is made functional at the factory by fully testing at least one operational set of regions including an I-region, an E-region and a write cache region. The operational set of regions works as a separate self-contained virtual disk drive and can be used immediately. The remaining untested areas on the media can be tested in the field by a background task and/or when the first write command is received that requires a new track or operational set of regions (on-the fly testing).
    Type: Application
    Filed: December 6, 2011
    Publication date: June 6, 2013
    Inventors: Marco Sanvido, Zvonimir Bandic, Yuval Cassuto, Jorge Campello De Souza, Cyril Guyot, Tomohiro Harayama
  • Publication number: 20120303866
    Abstract: Methods are described that allow disk drives, such as shingle-written magnetic recording (SMR) drives, to recover an Indirection Address Table mapping of LBAs to PBAs after an emergency power off (EPO). Indirection Address Table (IAT) snapshots are periodically written inline with user data stores, and in one embodiment Cumulative Delta Lists (CDLs) with incremental address update information are stored between snapshots. In an embodiment of the invention, when an imminent loss of power is detected, the current CDL, covering IAT updates not yet written to disk, is saved to a nonvolatile memory. The IAT snapshots combined with the set of CDLs provide the information needed to recreate the current Indirection Address Table when power is restored after an emergency power loss. In an alternative embodiment the CDL is obviated by including metadata in the sector that encodes the address indirection mapping and the last snapshot ID.
    Type: Application
    Filed: September 27, 2011
    Publication date: November 29, 2012
    Inventors: Zvonimir Z. Bandic, Yuval Cassuto, Jonathan Darrel Coker, Cyril Guyot, Marco Sanvido
  • Patent number: 8315394
    Abstract: A data storage device encrypts data stored in non-volatile memory using a bulk encryption key. The data storage device uses a key derivation function to generate an initial encryption key. The data storage device then wraps an intermediate encryption key with the initial encryption key and stores the wrapped intermediate key in the non-volatile memory. The data storage device wraps the bulk encryption key with the intermediate encryption key and stores the wrapped bulk encryption key in the non-volatile memory. The data storage device can unwrap the wrapped intermediate key to generate the intermediate encryption key using the initial encryption key. The data storage device can unwrap the wrapped bulk encryption key to generate the bulk encryption key using the intermediate encryption key. The data storage device decrypts data stored in the non-volatile memory using the bulk encryption key.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: November 20, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Marco Sanvido, Anand Krishnamurthi Kulkarni, Cyril Guyot, Richard M. H. New, Jorge Campello de Souza
  • Patent number: 8271801
    Abstract: A method, apparatus and a data storage device are provided for implementing data confidentiality and integrity of data stored in overlapping, shingled data tracks on a recordable surface of a storage device. A unique write counter is stored for each zone written to the recordable surface of the storage device. An encryption key is used together with the write counter information and a logical block address to encrypt each sector being written, and to decrypt all sectors being read. An individual sector is decrypted, obtaining the write counter information and reading the data sector. A message authentication code is stored for each zone. All sectors of the zone are read to perform integrity check on a sector.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: September 18, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventor: Cyril Guyot
  • Patent number: 8250380
    Abstract: A method and apparatus are provided for implementing secure erase for solid state drives (SSDs). An encryption key is used to encrypt data being written to SSD. A controller identifies a key storage option, and responsive to the identified key storage option, stores a key for data encryption and decryption. The controller deletes the key within the SSD responsive to the identified key storage option, ensuring that once the key is deleted, the key is not recoverable and data is effectively erased.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: August 21, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Cyril Guyot, Zvonimir Z. Bandic, Yuval Cassuto, Adam Michael Espeseth, Marco Sanvido
  • Publication number: 20120110343
    Abstract: Secure timestamps created by a data storage device are described. Metadata timestamp is created for each recorded unit of data (such as a sector) The HDD performs the time-stamping in a secure manner. The timestamp is made secure by performing a secure operation (i.e. one that can only be performed by the HDD) using the data and timestamp. The secure operation uses a secure key that is built-in to the storage device and is not readable outside of the device. In some embodiments the secure operation is encryption using the secure key. In other embodiments the secure operation is a hash code function (such as a Hash-based Message Authentication Code (HMAC) function) that uses the secure key to generate a hash code using at least the recorded data and the timestamp as input. The hash code is then included in the metadata that is recorded for the data unit.
    Type: Application
    Filed: October 29, 2010
    Publication date: May 3, 2012
    Inventors: Zvonimir Z. Bandic, Cyril Guyot, Timothy Kohchih Tsai
  • Patent number: 8059352
    Abstract: Patterned-media magnetic recording disks are made from a master template that has nondata regions that contain a pattern of one or more discrete nondata islands and discrete gaps, with the pattern representing a scrambled number. All disks made from the master template, or from replica molds made from the master, will have the same patterns. When the disks are DC-magnetized so that all the nondata islands are magnetized in the same direction, these patterns will include one or more of discrete magnetized nondata islands and discrete nonmagnetic gaps that are scrambled in a pseudo-random manner. During operation of the disk drive the patterns are detected by the read head and interpreted within the disk drive using knowledge of the pseudo-random scrambling function, so that reading and writing of data can occur in the conventional manner. If the disks are copied in an attempt to replicate the master template, the resulting disks will be inoperable in a disk drive because of the scrambling.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: November 15, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Zvonimir Z. Bandic, Jorge Campello de Souza, Cyril Guyot, Bruce Alexander Wilson
  • Patent number: 8019935
    Abstract: A hard disk drive is provided for enhancing random number generation. In particular embodiments, the hard disk drive includes a storage subsystem and a controller. The controller generates a random number based on information associated with the storage subsystem. The controller transmits the random number to a host system.
    Type: Grant
    Filed: December 23, 2007
    Date of Patent: September 13, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Cyril Guyot, Zvonimir Bandic, Anand Krishnamurthi Kulkarni
  • Patent number: 7971241
    Abstract: A verifiable security mode is provided for securing data on a storage device, such as a hard disk drive. When the verifiable security mode is enabled, only authenticated accesses to data stored on the storage device are permitted after entering a password. An end user is prevented from disabling the verifiable security mode. The verifiable security mode can be set to allow or disallow an administrator from disabling the verifiable security mode. The verifiable security mode can be implemented, for example, in firmware on a hard disk drive (HDD).
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: June 28, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Cyril Guyot, Jorge Campello de Souza, Anand Krishnamurthi Kulkarni, Richard M. H. New
  • Publication number: 20110154060
    Abstract: A method and apparatus are provided for implementing secure erase for solid state drives (SSDs). An encryption key is used to encrypt data being written to SSD. A controller identifies a key storage option, and responsive to the identified key storage option, stores a key for data encryption and decryption. The controller deletes the key within the SSD responsive to the identified key storage option, ensuring that once the key is deleted, the key is not recoverable and data is effectively erased.
    Type: Application
    Filed: December 17, 2009
    Publication date: June 23, 2011
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Cyril Guyot, Zvonimir Z. Bandic, Yuval Cassuto, Adam Michael Espeseth, Marco Sanvido
  • Patent number: 7965465
    Abstract: A data storage apparatus includes a data storage medium, a write element, a non-volatile cache memory circuit, and a controller circuit. The controller circuit is configured to record data on the data storage medium in groups of overlapping tracks using the write element. The controller circuit is configured to store a shingle block of data from a subset of the overlapping tracks in the non-volatile cache memory circuit, while at least a portion of the data in the shingle block of data is updated.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: June 21, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Marco Sanvido, Cyril Guyot, Anand Krishnamurthi Kulkarni, Zvonimir Bandic, Martin Chen
  • Publication number: 20110119498
    Abstract: A method, apparatus and a data storage device are provided for implementing data confidentiality and integrity of data stored in overlapping, shingled data tracks on a recordable surface of a storage device. A unique write counter is stored for each zone written to the recordable surface of the storage device. An encryption key is used together with the write counter information and a logical block address to encrypt each sector being written, and to decrypt all sectors being read. An individual sector is decrypted, obtaining the write counter information and reading the data sector. A message authentication code is stored for each zone. All sectors of the zone are read to perform integrity check on a sector.
    Type: Application
    Filed: November 19, 2009
    Publication date: May 19, 2011
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventor: Cyril Guyot
  • Publication number: 20110026155
    Abstract: Patterned-media magnetic recording disks are made from a master template that has nondata regions that contain a pattern of one or more discrete nondata islands and discrete gaps, with the pattern representing a scrambled number. All disks made from the master template, or from replica molds made from the master, will have the same patterns. When the disks are DC-magnetized so that all the nondata islands are magnetized in the same direction, these patterns will include one or more of discrete magnetized nondata islands and discrete nonmagnetic gaps that are scrambled in a pseudo-random manner. During operation of the disk drive the patterns are detected by the read head and interpreted within the disk drive using knowledge of the pseudo-random scrambling function, so that reading and writing of data can occur in the conventional manner. If the disks are copied in an attempt to replicate the master template, the resulting disks will be inoperable in a disk drive because of the scrambling.
    Type: Application
    Filed: October 14, 2010
    Publication date: February 3, 2011
    Applicant: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
    Inventors: Zvonimir Z. Bandic, Jorge Campello de Souza, Cyril Guyot, Bruce Alexander Wilson
  • Patent number: 7880990
    Abstract: Patterned-media magnetic recording disks are made from a master template that has nondata regions that contain a pattern of one or more discrete nondata islands and discrete gaps, with the pattern representing a scrambled number. All disks made from the master template, or from replica molds made from the master, will have the same patterns. When the disks are DC-magnetized so that all the nondata islands are magnetized in the same direction, these patterns will include one or more of discrete magnetized nondata islands and discrete nonmagnetic gaps that are scrambled in a pseudo-random manner. During operation of the disk drive the patterns are detected by the read head and interpreted within the disk drive using knowledge of the pseudo-random scrambling function, so that reading and writing of data can occur in the conventional manner. If the disks are copied in an attempt to replicate the master template, the resulting disks will be inoperable in a disk drive because of the scrambling.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: February 1, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Zvonimir Z. Bandic, Jorge Campello de Souza, Cyril Guyot, Bruce Alexander Wilson
  • Publication number: 20100232057
    Abstract: A data storage apparatus includes a data storage medium, a write element, a non-volatile cache memory circuit, and a controller circuit. The controller circuit is configured to record data on the data storage medium in groups of overlapping tracks using the write element. The controller circuit is configured to store a shingle block of data from a subset of the overlapping tracks in the non-volatile cache memory circuit, while at least a portion of the data in the shingle block of data is updated.
    Type: Application
    Filed: March 11, 2009
    Publication date: September 16, 2010
    Applicant: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Marco Sanvido, Cyril Guyot, Anand Krishnamurthi Kulkarni, Zvonimir Bandic, Martin Chen
  • Publication number: 20100142076
    Abstract: Patterned-media magnetic recording disks are made from a master template that has nondata regions that contain a pattern of one or more discrete nondata islands and discrete gaps, with the pattern representing a scrambled number. All disks made from the master template, or from replica molds made from the master, will have the same patterns. When the disks are DC-magnetized so that all the nondata islands are magnetized in the same direction, these patterns will include one or more of discrete magnetized nondata islands and discrete nonmagnetic gaps that are scrambled in a pseudo-random manner. During operation of the disk drive the patterns are detected by the read head and interpreted within the disk drive using knowledge of the pseudo-random scrambling function, so that reading and writing of data can occur in the conventional manner. If the disks are copied in an attempt to replicate the master template, the resulting disks will be inoperable in a disk drive because of the scrambling.
    Type: Application
    Filed: December 10, 2008
    Publication date: June 10, 2010
    Applicant: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
    Inventors: Zvonimir Z. Bandic, Jorge Campello de Souza, Cyril Guyot, Bruce Alexander Wilson
  • Publication number: 20100030958
    Abstract: A hard disk drive is provided for enhancing random number generation. In particular embodiments, the hard disk drive includes a storage subsystem and a controller. The controller generates a random number based on information associated with the storage subsystem. The controller transmits the random number to a host system.
    Type: Application
    Filed: December 23, 2007
    Publication date: February 4, 2010
    Applicant: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Cyril Guyot, Zvonimir Bandic, Anand Krishnamurthi Kulkarni
  • Publication number: 20090161246
    Abstract: A hard disk drive enhances random number generation. In particular embodiments, the hard disk drive includes a controller, a hard disk, and a head. The head includes a read sensor for reading patterns on the hard disk. The controller generates a random number based on information associated with the position of the head relative to at least one track of the hard disk.
    Type: Application
    Filed: December 23, 2007
    Publication date: June 25, 2009
    Applicant: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Zvonimir Bandic, Satoshi Yamamoto, Minoru Hashimoto, Cyril Guyot, Anand Krishnamurthi Kulkarni, Marco Sanvido, Jorge Campello de Souza
  • Publication number: 20090110191
    Abstract: A data storage device encrypts data stored in non-volatile memory using a bulk encryption key. The data storage device uses a key derivation function to generate an initial encryption key. The data storage device then wraps an intermediate encryption key with the initial encryption key and stores the wrapped intermediate key in the non-volatile memory. The data storage device wraps the bulk encryption key with the intermediate encryption key and stores the wrapped bulk encryption key in the non-volatile memory. The data storage device can unwrap the wrapped intermediate key to generate the intermediate encryption key using the initial encryption key. The data storage device can unwrap the wrapped bulk encryption key to generate the bulk encryption key using the intermediate encryption key. The data storage device decrypts data stored in the non-volatile memory using the bulk encryption key.
    Type: Application
    Filed: October 24, 2007
    Publication date: April 30, 2009
    Applicant: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Marco Sanvido, Anand Krishnamurthi Kulkarni, Cyril Guyot, Richard M.H. New, Jorge Campello de Souza