Write reordering in a hybrid disk drive

a hybrid disk drive and write reordering technology, applied in the field of disk drives, can solve the problems of limited time available for an hdd to select the next write command to be executed in the command queue, and the improvement of the random write performance of the hdd is generally limited, so as to increase the rate at which data are transferred

Inactive Publication Date: 2013-09-19
KK TOSHIBA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]One or more embodiments of the present invention provide systems and methods for

Problems solved by technology

However, the time available for an HDD to select the next write command to be executed in the command queue is limited; during the time that the current write command is being executed, the queue of remaining commands must be reordered and the writ

Method used

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  • Write reordering in a hybrid disk drive
  • Write reordering in a hybrid disk drive
  • Write reordering in a hybrid disk drive

Examples

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Embodiment Construction

[0026]FIG. 1 is a schematic view of an exemplary disk drive, according to an embodiment of the invention. For clarity, disk drive 100 is illustrated without a top cover. Disk drive 100 includes at least one storage disk 110 that is rotated by a spindle motor 114. Spindle motor 114 is mounted on a base plate 116. An actuator arm assembly 120 is also mounted on base plate 116, and has a slider 121 mounted on a flexure arm 122 with a read / write head 127. Flexure arm 122 is attached to an actuator arm 124 that rotates about a bearing assembly 126. Voice coil motor 128 moves slider 121 relative to storage disk 110, thereby positioning read / write head 127 over the desired concentric data storage track disposed on the surface 112 of storage disk 110. Spindle motor 114, read / write head 127, and voice coil motor 128 are coupled to electronic circuits 130, which are mounted on a printed circuit board 132. The electronic circuits 130 include a read channel, a microprocessor-based controller 13...

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Abstract

A hybrid drive and associated methods increase the rate at which data are transferred to a nonvolatile storage medium in the hybrid drive. By using a large nonvolatile solid state memory device as cache memory for a magnetic disk drive, a very large number of write commands can be cached and subsequently reordered and executed in an efficient manner. In addition, strategic selection and reordering of only a portion of the write commands stored in the nonvolatile solid state memory device increases efficiency of the reordering process.

Description

BACKGROUND [0001]1. Field of the Invention[0002]Embodiments of the present invention relate generally to disk drives and, more particularly, to systems and methods of write reordering in a hybrid disk drive.[0003]2. Description of the Related Art[0004]A hard disk drive (HDD) is a commonly used data storage device for the computer and primarily stores digital data in concentric tracks on the surface of a data storage disk. The data storage disk is a rotatable hard disk with a layer of magnetic material thereon, and data are read from or written to a desired track on the data storage disk using a read / write head that is held proximate to the track while the disk spins about its center at a constant angular velocity. Data are written to the data storage disk in accordance with a write command transferred to the HDD from a host computer.[0005]Generally, write commands can be received by an HDD much more quickly than the data associated with each command can be written to the data storag...

Claims

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Application Information

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IPC IPC(8): G11B5/86G06F12/02
CPCG11B5/012G06F12/0804G06F12/0868G06F2212/217G11B2220/45G11B20/10G11B20/12G11B2020/1294G06F2212/222G06F3/0611G06F3/064G06F3/0647G06F3/068G06F2212/1024G06F2212/253G06F2212/281G06F2212/305G06F2212/313G06F2212/461G06F2212/70
Inventor ZAYAS, FERNANDO A.EHRLICH, RICHARD M.DUNN, ERIC R.
Owner KK TOSHIBA
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