Patents by Inventor Rajeev Y. Nagar
Rajeev Y. Nagar 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).
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Patent number: 10216637Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: GrantFiled: July 21, 2016Date of Patent: February 26, 2019Assignee: Microsoft Technology Licensing, LLCInventors: Cenk Ergan, Clark D. Nicholson, Dan Teodosiu, Dean L. DeWhitt, Emily Nicole Wilson, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Publication number: 20170132136Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: ApplicationFiled: July 21, 2016Publication date: May 11, 2017Inventors: Cenk Ergan, Clark D. Nicholson, Daniel Teodosiu, Dean L. DeWhitt, Emily Nicole Wilson, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Patent number: 9405693Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: GrantFiled: July 23, 2012Date of Patent: August 2, 2016Assignee: Microsoft Technology Licensing, LLCInventors: Cenk Ergan, Clark D. Nicholson, Daniel Teodosiu, Dean L. DeWhitt, Emily Nicole Hill, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Publication number: 20120290785Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: ApplicationFiled: July 23, 2012Publication date: November 15, 2012Applicant: Microsoft CorporationInventors: Cenk Ergan, Clark D. Nicholson, Dan Teodosiu, Dean L. DeWhitt, Emily Nicole Hill, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Patent number: 8255645Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: GrantFiled: September 13, 2011Date of Patent: August 28, 2012Assignee: Microsoft CorporationInventors: Cenk Ergan, Clark D. Nicholson, Dan Teodosiu, Dean L. DeWhitt, Emily Nicole Hill, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Patent number: 8121007Abstract: A file system which is enabled to use a Metadata Partition instead of VAT for write-once discs, is provided by a pseudo-overwrite method. On applying this invention to a drive apparatus which supports pseudo-overwrite media, the file system distinguishes data to overwrite from data to append. When the data is newly written to a logical sector, the drive apparatus writes the data to a physical sector to which the logical sector corresponds. When the logical sector is overwritten the data is written to another unrecorded physical sector in the volume space, and remapping information that specifies the original address, and the remapping address are stored in the remapping table.Type: GrantFiled: May 9, 2005Date of Patent: February 21, 2012Assignees: Panasonic Corporation, Microsoft CorporationInventors: Rajeev Y. Nagar, Garret J. Buban, Yoshiho Gotoh, Sarosh C. Havewala, Ravinder S. Thind, Vishal V. Ghotge
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Publication number: 20120005422Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: ApplicationFiled: September 13, 2011Publication date: January 5, 2012Applicant: Microsoft CorporationInventors: Cenk Ergan, Clark D. Nicholson, Dan Teodosiu, Dean L. DeWhitt, Emily Nicole Hill, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Patent number: 8072860Abstract: A file system is enabled to use a Metadata Partition instead of VAT for write-once discs, and is provided by a pseudo-overwrite method with a plurality of tracks especially for metadata and file data. On applying this invention to a drive apparatus that supports pseudo-overwrite media, the file system distinguishes data to overwrite from data to append (S1701). When the data is newly written to a logical sector, the drive apparatus writes the data to a physical sector to which the logical sector corresponds (S1703). When the data being overwritten is data stored in the logical sector, the data is written to the other unrecorded physical sector in the volume space (S1704), and remapping information is written (S1705). The remapping information specifies the original address of the physical sector, and the remapping address of the physical sector in which the data is written.Type: GrantFiled: May 9, 2005Date of Patent: December 6, 2011Assignees: Panasonic Corporation, Microsoft CorporationInventors: Garret J. Buban, Yoshiho Gotoh, Rajeev Y. Nagar, Sarosh C. Havewala, Vishal V. Ghotge, Ravinder S. Thind
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Patent number: 8041904Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: GrantFiled: November 30, 2009Date of Patent: October 18, 2011Assignee: Microsoft CorporationInventors: Cenk Ergan, Clark D. Nicholson, Dan Teodosiu, Dean L. DeWhitt, Emily Nicole Hill, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Patent number: 7840730Abstract: Described is a technology by which a storage volume is shared by cluster nodes of a server cluster. In one implementation, each node includes a redirector that provides shared access to the volume from that node. The redirector routes file system metadata requests from applications and the like through a first (e.g., SMB) communications path to the owning node, and routes file system read and write data to the storage device through a second, high-speed communications path such as direct direct block level I/O. An owning node maintains ownership of the storage device through a persistent reservation mechanism that writes a key to a registration table associated with the storage device. Non-owning nodes write a shared key. The owning node validates the shared keys against cluster membership data, and preempts (e.g., removes) any key deemed not valid. Security mechanisms for controlling access are also described.Type: GrantFiled: June 27, 2008Date of Patent: November 23, 2010Assignee: Microsoft CorporationInventors: Andrea D'Amato, Rajeev Y. Nagar, Gor Nishanov, Rajsekhar Das, Gregorio Maeso
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Patent number: 7821896Abstract: A recording method of the present invention includes the steps of: receiving a write instruction which specifies at least a logical sector in which data is to be written; determining whether the logical sector specified by the write instruction corresponds to a recorded physical sector or an unrecorded physical sector (S1111); when it is determined that the logical sector specified by the write instruction corresponds to an unrecorded physical sector, writing the data into the unrecorded physical sector (S1112); and when it is determined that the logical sector specified by the write instruction corresponds to a recorded physical sector, writing the data into an unrecorded physical sector other than the recorded physical sector (S1113), generating a remapping table including remapping information which remaps an original address of the recorded physical sector to a remapping address of the selected physical sector, and writing the remapping table on the write-once disc (S1114).Type: GrantFiled: May 9, 2005Date of Patent: October 26, 2010Assignees: Panasonic Corporation, Microsoft CorporationInventors: Yoshiho Gotoh, Garret J. Buban, Rajeev Y. Nagar, Sarosh C. Havewala, Ravinder S. Thind, Vishal V. Ghotge
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Patent number: 7823032Abstract: The recording method of the present invention includes the steps of: receiving a write instruction which specifies at least a logical sector in which data is to be written; determining whether the logical sector corresponds to a recorded physical sector or an unrecorded physical sector; when it is determined that the logical sector corresponds to an unrecorded physical sector, writing the data into the unrecorded physical sector, determining whether a verification of the data which has been written into a physical sector is successful, if the verification of the data that has been written is not successful, writing the data into an unrecorded physical sector, generating a remapping table including remapping information which remaps an original address of the physical sector corresponding to the logical sector to a remapping address of the selected physical sector, and writing the remapping table on the write-once disc.Type: GrantFiled: May 9, 2005Date of Patent: October 26, 2010Assignees: Panasonic Corporation, Microsoft CorporationInventors: Vishal V. Ghotge, Ravinder S Thind, Yoshiho Gotoh, Rajeev Y. Nagar, Garret J. Buban, Sarosh C. Havewala
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Publication number: 20100077197Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: ApplicationFiled: November 30, 2009Publication date: March 25, 2010Applicant: Microsoft CorporationInventors: Cenk Ergan, Clark D. Nicholson, Dan Teodosiu, Dean L. DeWhitt, Emily Nicole Hill, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Patent number: 7653642Abstract: Method and system for establishing and maintaining quotas. An auto quota is defined and applied to a directory. Input and output is monitored to detect a successful operation that involves a subdirectory of the directory. A determination is made as to whether to apply a quota associated with the auto quota to the subdirectory. If the determination is that the quota is to be applied to the subdirectory, it is automatically applied.Type: GrantFiled: November 30, 2004Date of Patent: January 26, 2010Assignee: Microsoft CorporationInventors: Ravinder S. Thind, Neal R. Christiansen, Ran Kalach, James R. Benton, Rajeev Y. Nagar
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Patent number: 7644239Abstract: In order to provide a more efficient persistent storage device, one or more long-term storage media are included along with a non-volatile memory. In one embodiment, one portion of the non-volatile memory is used as a write buffer and a read cache for writes and reads to the long-term storage media. Interfaces are provided for controlling the use of the non-volatile memory as a write buffer and a read cache. Additionally, a portion of the non-volatile memory is used to provide a direct mapping for specified sectors of the long-term storage media. Descriptive data regarding the persistent storage device is stored in another portion of the non-volatile memory.Type: GrantFiled: May 3, 2004Date of Patent: January 5, 2010Assignee: Microsoft CorporationInventors: Cenk Ergan, Clark D. Nicholson, Dan Teodosiu, Dean L. DeWhitt, Emily Nicole Hill, Hanumantha R. Kodavalla, Michael J. Zwilling, John M. Parchem, Michael R. Fortin, Nathan Steven Obr, Rajeev Y. Nagar, Surenda Verma, Therron Powell, William J. Westerinen, Mark Joseph Zbikowski, Patrick L. Stemen
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Publication number: 20090327798Abstract: Described is a technology by which a storage volume is shared by cluster nodes of a server cluster. In one implementation, each node includes a redirector that provides shared access to the volume from that node. The redirector routes file system metadata requests from applications and the like through a first (e.g., SMB) communications path to the owning node, and routes file system read and write data to the storage device through a second, high-speed communications path such as direct direct block level I/O. An owning node maintains ownership of the storage device through a persistent reservation mechanism that writes a key to a registration table associated with the storage device. Non-owning nodes write a shared key. The owning node validates the shared keys against cluster membership data, and preempts (e.g., removes) any key deemed not valid. Security mechanisms for controlling access are also described.Type: ApplicationFiled: June 27, 2008Publication date: December 31, 2009Applicant: MICROSOFT CORPORATIONInventors: Andrea D'Amato, Rajeev Y. Nagar, Gor Nishanov, Rajsekhar Das, Gregorio Maeso
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Publication number: 20080310289Abstract: A recording method of the present invention includes the steps of: receiving a write instruction which specifies at least a logical sector in which data is to be written; determining whether the logical sector specified by the write instruction corresponds to a recorded physical sector or an unrecorded physical sector (S1111); when it is determined that the logical sector specified by the write instruction corresponds to an unrecorded physical sector, writing the data into the unrecorded physical sector (S1112); and when it is determined that the logical sector specified by the write instruction corresponds to a recorded physical sector, writing the data into an unrecorded physical sector other than the recorded physical sector (S1113), generating a remapping table including remapping information which remaps an original address of the recorded physical sector to a remapping address of the selected physical sector, and writing the remapping table on the write-once disc (S1114).Type: ApplicationFiled: May 9, 2005Publication date: December 18, 2008Inventors: Yoshiho Gotoh, Garret J. Buban, Rajeev Y. Nagar, Sarosh C. Havewala, Ravinder S. Thind, Vishal V. Ghotge
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Publication number: 20080232210Abstract: A file system is enabled to use a Metadata Partition instead of VAT for write-once discs, and is provided by a pseudo-overwrite method with a plurality of tracks especially for metadata and file data. On applying this invention to a drive apparatus that supports pseudo-overwrite media, the file system distinguishes data to overwrite from data to append (S1701). When the data is newly written to a logical sector, the drive apparatus writes the data to a physical sector to which the logical sector corresponds (S1703). When the data being overwritten is data stored in the logical sector, the data is written to the other unrecorded physical sector in the volume space (S1704), and remapping information is written (S1705). The remapping information specifies the original address of the physical sector, and the remapping address of the physical sector in which the data is written.Type: ApplicationFiled: May 9, 2005Publication date: September 25, 2008Applicants: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., Microsoft CorporationInventors: Garret J. Buban, Yoshiho Gotoh, Rajeev Y. Nagar, Sarosh C. Havewala, Vishal V. Ghotge, Ravinder S. Thind
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Publication number: 20080192595Abstract: The recording method of the present invention includes the steps of: receiving a write instruction which specifies at least a logical sector in which data is to be written; determining whether the logical sector corresponds to a recorded physical sector or an unrecorded physical sector; when it is determined that the logical sector corresponds to an unrecorded physical sector, writing the data into the unrecorded physical sector, determining whether a verification of the data which has been written into a physical sector is successful, if the verification of the data that has been written is not successful, writing the data into an unrecorded physical sector, generating a remapping table including remapping information which remaps an original address of the physical sector corresponding to the logical sector to a remapping address of the selected physical sector, and writing the remapping table on the write-once disc.Type: ApplicationFiled: May 9, 2005Publication date: August 14, 2008Inventors: Vishal V. Ghotge, Ravinder S. Thind, Yoshiho Gotoh, Rajeev Y. Nagar, Garret J. Buban, Sarosh C. Havewala
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Patent number: 7325115Abstract: An operating system copies data from memory pages into a paging file on disk, in order to free up space in the memory. A mechanism is disclosed that causes the data to be encrypted as it is copied into the paging file, thereby protecting the paged data from unauthorized (or otherwise undesired) observation. The data that is stored in the paging file is encrypted with a session key, that is generated shortly after the machine on which the paging file exists is started. The session key, which is used both for encryption and decryption of the paging file data, is stored in volatile memory, so that the key is not persisted across boots of the machine. Since the key is not persisted across boots, old paging file data that was stored prior to the most recent boot cannot be recovered in clear text, thereby protecting the data from observation.Type: GrantFiled: November 25, 2003Date of Patent: January 29, 2008Assignee: Microsoft CorporationInventors: Benjamin A. Leis, David B. Cross, Duncan G. Bryce, Jianrong Gu, Rajeev Y. Nagar, Scott A. Field