Patents by Inventor Pantelis Alexopoulos
Pantelis Alexopoulos 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: 10056147Abstract: A data storage device includes a first data storage medium having a first capacity and a first speed, a second data storage medium having a second capacity and a second speed, and a device controller for interfacing between the data storage device and a host system. The second capacity is greater than the first capacity and the second speed is slower than the first speed. The device controller presents the data storage device to the host system as having a device capacity at least equal to the second capacity and a device speed at least equal to the first speed. The first data storage medium may be a solid-state drive while the second data storage medium is a hard disk drive. The device controller may be a solid-state drive controller, or a hard disk drive controller that may accept at least one solid-state drive command, such as a TRIM command.Type: GrantFiled: May 24, 2017Date of Patent: August 21, 2018Assignee: Marvell International Ltd.Inventors: Pantelis Alexopoulos, Dimitry Melts, Christophe Therene, Shinichiro Kuno
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Publication number: 20170277477Abstract: An active storage system is disclosed. The active storage system includes a storage device, a non-volatile memory and an active drive controller. The active drive controller performs data management and/or cluster management within the active storage system, the active drive controller including a data interface for receiving at least object and/or file data.Type: ApplicationFiled: October 2, 2015Publication date: September 28, 2017Inventors: Weiya XI, Chao JIN, Khai Leong YONG, Pantelis ALEXOPOULOS
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Publication number: 20170277447Abstract: A printed circuit board assembly (PCBA) for a storage device comprising a non-volatile memory (NVM) and a multi-core processor, wherein a first core of the multi-core processor is devoted to external interface management and a second core of the multi-core processor is devoted to internal data management.Type: ApplicationFiled: September 28, 2015Publication date: September 28, 2017Inventors: Weiya XI, Chao JIN, Khai Leong YONG, Pantelis ALEXOPOULOS
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Patent number: 9343083Abstract: A system including a write head, a read head, a mixer, and a filter. The write head is configured to write a pattern on a track of a medium of a hard disk drive, wherein the pattern has a first frequency. The read head is configured to read the pattern written on the track of the medium of the hard disk drive. The mixer is configured to mix a first signal generated by reading the pattern with a second signal to obtain a mixed signal. The second signal has a second frequency, and wherein the second frequency is different than the first frequency. The filter is configured to filter the mixed signal to determine a relative head-to-disk speed. The filter has a parameter selected based on a difference between the first frequency and the second frequency.Type: GrantFiled: June 29, 2015Date of Patent: May 17, 2016Assignee: Marvell International LTD.Inventors: Budi Santoso, Zhimin Yuan, Siang Huei Leong, Chun Lian Ong, Pantelis Alexopoulos
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Patent number: 9275654Abstract: A servo system for writing servo information on a recording medium of a hard disk drive and for determining head position based on the servo information with a tracking accuracy, the servo system including a first magnetic head and a servo writer. The servo writer is configured to write the servo information on the recording medium by forming, using the first magnetic head, a first servo pattern comprising a servo burst pattern on a segment of a first track of a first layer of the recording medium; and by forming a second servo pattern comprising addressing information on a segment of a second track of a second layer of the recording medium. The second track is arranged half a width of the first track from the first track to increase the tracking accuracy of the servo system.Type: GrantFiled: August 17, 2015Date of Patent: March 1, 2016Assignee: Marvell International LTD.Inventors: Chiew Leong Wong, Pantelis Alexopoulos, Zhimin Yuan, Chun Lian Ong
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Publication number: 20150380034Abstract: A servo system for writing servo information on a recording medium of a hard disk drive and for determining head position based on the servo information with a tracking accuracy, the servo system including a first magnetic head and a servo writer. The servo writer is configured to write the servo information on the recording medium by forming, using the first magnetic head, a first servo pattern comprising a servo burst pattern on a segment of a first track of a first layer of the recording medium; and by forming a second servo pattern comprising addressing information on a segment of a second track of a second layer of the recording medium. The second track is arranged half a width of the first track from the first track to increase the tracking accuracy of the servo system.Type: ApplicationFiled: August 17, 2015Publication date: December 31, 2015Inventors: Chiew Leong Wong, Pantelis Alexopoulos, Zhimin Yuan, Chun Lian Ong
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Patent number: 9202512Abstract: 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.Type: GrantFiled: August 31, 2012Date of Patent: December 1, 2015Assignee: Marvell International LTD.Inventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
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Publication number: 20150302871Abstract: A system including a write head, a read head, a mixer, and a filter. The write head is configured to write a pattern on a track of a medium of a hard disk drive, wherein the pattern has a first frequency. The read head is configured to read the pattern written on the track of the medium of the hard disk drive. The mixer is configured to mix a first signal generated by reading the pattern with a second signal to obtain a mixed signal. The second signal has a second frequency, and wherein the second frequency is different than the first frequency. The filter is configured to filter the mixed signal to determine a relative head-to-disk speed. The filter has a parameter selected based on a difference between the first frequency and the second frequency.Type: ApplicationFiled: June 29, 2015Publication date: October 22, 2015Inventors: Budi Santoso, Zhimin Yuan, Siang Huei Leong, Chun Lian Ong, Pantelis Alexopoulos
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Patent number: 9111562Abstract: In various embodiments, a method of writing servo information to a recording medium may be provided. The method include forming a first servo pattern (including a servo burst pattern) on a segment of a first track of a first layer of the recording medium, the first track having a track width. The method may further include forming a second servo pattern (including addressing information) on a segment of a second track of a second layer of the recording medium. The second track is arranged from the first track by half the track width.Type: GrantFiled: February 18, 2013Date of Patent: August 18, 2015Assignee: Marvell International Ltd.Inventors: Chiew Leong Wong, Pantelis Alexopoulos, Zhimin Yuan, Chun Lian Ong
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Patent number: 9070416Abstract: Methods and architecture for monitoring hard disk drive operation is provided. The hard disk drive system provided includes a spindle, a head and a disk with a disk medium including a buried servo layer having a first frequency of data on a first track and a second frequency of data on a second track, the second track adjacent to the first track. The method includes the steps of writing a wide track pattern having a predetermined frequency on a track of a hard disk drive medium, generating a readback signal by reading the pattern from the track, processing the readback signal by mixing the readback signal with a reference signal to obtain a mixed signal having a summed signal and a difference signal, and filtering the mixed signal by a filter centered around the difference signal to generate a measurement signal corresponding to a relative speed change of the spindle and a head-to-disk motion.Type: GrantFiled: May 10, 2013Date of Patent: June 30, 2015Assignee: Marvell International LTD.Inventors: Budi Santoso, Zhimin Yuan, Siang Huei Leong, Chun Lian Ong, Pantelis Alexopoulos
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Publication number: 20150146322Abstract: 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.Type: ApplicationFiled: August 31, 2012Publication date: May 28, 2015Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
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Publication number: 20150009589Abstract: In various embodiments, a method of writing servo information to a recording medium may be provided. The method include forming a first servo pattern (including a servo burst pattern) on a segment of a first track of a first layer of the recording medium, the first track having a track width. The method may further include forming a second servo pattern (including addressing information) on a segment of a second track of a second layer of the recording medium. The second track is arranged from the first track by half the track width.Type: ApplicationFiled: February 18, 2013Publication date: January 8, 2015Inventors: Chiew Leong Wong, Pantelis Alexopoulos, Zhimin Yuan, Chun Lian Ong
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Patent number: 8065481Abstract: A RAID system is provided which can be implemented as a hardware RAID system while avoiding certain shortcomings of previous RAID systems. The RAID system makes it possible to avoid or reduce the number of buffers or processors and can take advantage of drive logic to achieve RAID functions or enhancements. RAID functionality can be provided in a manner to accommodate one or more ATA drive interfaces. To avoid drive replacement problems, host requests for drive serial numbers are responded to with a mirror serial number. In one embodiment, the read address is used to select which drive will perform a read operation.Type: GrantFiled: April 20, 2004Date of Patent: November 22, 2011Assignee: Seagate Technology LLCInventors: Bernhard Hiller, Pantelis Alexopoulos, Don Brunnett, Chandra Buddhavaram, Thierry Chatard, David Chew, Samuel R. Duell, Jeff Griffiths, Johanna Hernandez, Robert L. Kimball, Eric Kvamme, LeRoy Leach, Michael Lee, James McGrath, Kathleen Fitzgerald, legal representative, Robert Milby, Bruce Schardt, Maurice Schlumberger, Erhard Schreck, Richard Sonnenfeld