SMR drive that maintains physical locations of bands via flush/copy operations

When a shingled magnetic recording (SMR) hard disk drive (HDD) performs additional SMR band copy and/or flush operations to ensure that data associated with logical bands that are adjacent or proximate in logical space are stored in physical locations in the SMR HDD that are proximate in physical space. As a result, efficient execution is ensured of read commands that span multiple logical bands of the SMR HDD.

Timing of power state change in a disk drive based on disk access history

A data storage device that includes a magnetic storage device and a non-magnetic nonvolatile storage device that measures a hit rate of read/write commands that result in accesses to the non-magnetic nonvolatile storage device, and adjusts a length of a time period, such as an idle time, based on the hit rate. The duration of the time period can be set each time the magnetic storage device is accessed. Upon expiration of the time period, if the magnetic storage device has not yet been accessed, the magnetic storage device is changed from a higher power consumption state to a lower power consumption state.

HYBRID DRIVE THAT IMPLEMENTS A DEFERRED TRIM LIST

A hybrid drive controller maintains a deferred trim list that holds a subset of logical addresses of writes performed on magnetic disks. For example, if a write command is issued to an LBA space that overlaps a portion stored in flash memory and the write is to be performed on the magnetic disks, the trimming of the overlapping portion in the flash memory will be deferred. Instead of trimming, the logical addresses associated with the overlapping portion will be added to the deferred trim list and trimming of the logical addresses in the deferred trim list will be carried out at a later time, asynchronous to the write that caused them to be added to the list. 1. A method of writing data in a data storage device having a magnetic storage medium divided into addressable blocks and a non-volatile solid-state device divided into addressable blocks , said method comprising:receiving a command to write data;determining that the non-volatile solid-state device has a valid block with a logical address referenced by the command;writing the data to a block of the magnetic storage medium, which has the same logical address as the valid block of the non-volatile solid-state device; andafter said writing, invalidating the valid block of the non-volatile solid-state device.2. The method of claim 1 , wherein the command references a plurality of logical addresses claim 1 , one of which is the logical address of the valid block.3. The method of claim 2 , wherein said determining claim 2 , said writing claim 2 , and said invalidating after said writing are carried out for all valid blocks of the non-volatile solid-state device that have a logical address referenced by the command.4. The method of claim 1 , further comprising:adding the logical address to a list of logical addresses of blocks of the non-volatile solid-state device to be invalidated; andprocessing the list to invalidate the blocks of the non-volatile solid-state device.5. The method of claim 4 , wherein the logical ...

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POWER STATE CHANGE IN DISK DRIVE BASED ON DISK ACCESS HISTORY

A data storage device that includes a magnetic storage device selects one or more power states of the magnetic storage device based on a time interval since a most recent time data has been read from or written to the magnetic storage device. The power state of the magnetic storage device can be changed from a higher power consumption state to a lower power consumption state when the time interval exceeds a predetermined value. The power consumption state may be changed from an active servo state to an intermediate power consumption state, a park state, and/or a standby state, depending on the time elapsed since the most recent time data has been read from or written to the magnetic storage device.

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LOW-OVERHEAD STORAGE OF A HIBERNATION FILE IN A HYBRID DISK DRIVE

A hybrid drive and associated methods provide low-overhead storage of a hibernation file in the hybrid hard disk drive. During operation, the hybrid drive allocates a portion of solid-state memory in the drive that is large enough to accommodate a hibernation file associated with a host device of the hybrid drive. In addition to the erased memory blocks that are normally present during operation of the hybrid drive, the portion of solid-state memory allocated for accommodating the hibernation file may include over-provisioned memory blocks, blocks used to store a previous hibernation file that has been trimmed, and/or non-dirty blocks.

POWER STATE CHANGE IN DISK DRIVE BASED ON DISK ACCESS HISTORY

A data storage device that includes a magnetic storage device selects one or more power states of the magnetic storage device based on a time interval since a most recent time data has been read from or written to the magnetic storage device. The power state of the magnetic storage device can be changed from a higher power consumption state to a lower power consumption state when the time interval exceeds a predetermined value. The power consumption state may be changed from an active servo state to an intermediate power consumption state, a park state, and/or a standby state, depending on the time elapsed since the most recent time data has been read from or written to the magnetic storage device. 1measuring a time interval since a most recent time data has been read from or written to the magnetic storage device; andin response to the time interval exceeding a predetermined value, changing a current power consumption state of the magnetic storage device to a lower power consumption state.. A method of power management in a data storage device that includes a magnetic storage device, the method comprising: This application is a divisional of U.S. patent application Ser. No. 13/788,502, filed Mar. 7, 2013, the entire contents of which are incorporated herein by reference.Disk drives primarily store digital data in concentric tracks on the surface of a data storage disk and are commonly used for data storage in electronic devices. The data storage disk is typically 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. To properly align the read/write head with a desired track during a read or write operation, disk drives generally use a closed-loop servo system that relies on servo data stored in servo sectors written on the disk surface when the disk ...

Low-overhead storage of a hibernation file in a hybrid disk drive

A hybrid drive and associated methods provide low-overhead storage of a hibernation file in the hybrid hard disk drive. During operation, the hybrid drive allocates a portion of solid-state memory in the drive that is large enough to accommodate a hibernation file associated with a host device of the hybrid drive. In addition to the erased memory blocks that are normally present during operation of the hybrid drive, the portion of solid-state memory allocated for accommodating the hibernation file may include over-provisioned memory blocks, blocks used to store a previous hibernation file that has been trimmed, and/or non-dirty blocks.

TIMING OF POWER STATE CHANGE IN A DISK DRIVE BASED ON DISK ACCESS HISTORY

A data storage device that includes a magnetic storage device and a non-magnetic nonvolatile storage device that measures a hit rate of read/write commands that result in accesses to the non-magnetic nonvolatile storage device, and adjusts a length of a time period, such as an idle time, based on the hit rate. The duration of the time period can be set each time the magnetic storage device is accessed. Upon expiration of the time period, if the magnetic storage device has not yet been accessed, the magnetic storage device is changed from a higher power consumption state to a lower power consumption state. 1. A method of power management in a data storage device that includes a magnetic storage device and a solid-state nonvolatile storage device , the method comprising:setting a time period each time the magnetic storage device is accessed, the magnetic storage device being changed to a lower power consumption state when the time period expires;measuring a number of accesses to the data storage device that are accesses to the solid-state nonvolatile storage device; andadjusting a length of the time period based on the measured number of accesses.2. The method of claim 1 , wherein adjusting the length of the time period comprises decrementing the length of the time period when the number of accesses exceeds a threshold value and incrementing the length of the time period when the number of accesses is less than the threshold value.3. The method of claim 2 , wherein decrementing the length of the time period comprises decreasing the time period by a predetermined time decrement value and incrementing the length of the time period comprises increasing the time period by a predetermined time increment value.4. The method of claim 1 , further comprising measuring a total number of accesses to the data storage device claim 1 , the total number of accesses including accesses to the non-magnetic nonvolatile storage device and accesses to the magnetic storage device.5. The ...

Write reordering in a hybrid disk drive

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.

Power state change in disk drive based on disk access history

A data storage device that includes a magnetic storage device selects one or more power states of the magnetic storage device based on a time interval since a most recent time data has been read from or written to the magnetic storage device. The power state of the magnetic storage device can be changed from a higher power consumption state to a lower power consumption state when the time interval exceeds a predetermined value. The power consumption state may be changed from an active servo state to an intermediate power consumption state, a park state, and/or a standby state, depending on the time elapsed since the most recent time data has been read from or written to the magnetic storage device.

WRITE REORDERING IN A HYBRID DISK DRIVE

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. 1. A data storage device comprising:a nonvolatile solid state memory device;a magnetic storage disk; anda control unit configured to order data blocks to be written to the magnetic storage disk by:writing the data blocks to the nonvolatile solid state memory device;selecting N data blocks out of M data blocks stored in the nonvolatile solid state memory device, where N is less than M;ordering the selected data blocks prior to writing the selected data blocks to the magnetic storage disk; andwriting the first of the ordered data blocks to the magnetic storage disk,wherein selecting N data blocks comprises selecting the N least-recently-used data blocks from a least-recently-used list of data blocks that are stored in the nonvolatile solid state memory device and have not been written to the magnetic storage disk.2. The data storage device of claim 1 , wherein the least-recently used list of data blocks comprises a recency list of data blocks written to the nonvolatile solid state memory device claim 1 , a frequency list of data blocks written to the nonvolatile solid state memory device claim 1 , or a combination of both.3. The data storage device of claim 2 , wherein at least one of the recency list and the frequency list comprises a linked list of data blocks in which a data structure is associated with each data block included in the linked list and includes a pointer referencing the next less-recently-used data block in the linked ...

POWER STATE CHANGE IN DISK DRIVE BASED ON DISK ACCESS HISTORY

A data storage device that includes a magnetic storage device selects one or more power states of the magnetic storage device based on a time interval since a most recent time data has been read from or written to the magnetic storage device. The power state of the magnetic storage device can be changed from a higher power consumption state to a lower power consumption state when the time interval exceeds a predetermined value. The power consumption state may be changed from an active servo state to an intermediate power consumption state, a park state, and/or a standby state, depending on the time elapsed since the most recent time data has been read from or written to the magnetic storage device.

Smr drive that maintains physical locations of bands via flush/copy operations

When a shingled magnetic recording (SMR) hard disk drive (HDD) performs additional SMR band copy and/or flush operations to ensure that data associated with logical bands that are adjacent or proximate in logical space are stored in physical locations in the SMR HDD that are proximate in physical space. As a result, efficient execution is ensured of read commands that span multiple logical bands of the SMR HDD.

データストレージデバイスおよび方法

【課題】より電力状態が低い電力消費状態に変更されることができるデータストレージデバイスおよび方法を提供すること。 【解決手段】実施形態によれば、磁気記憶デバイスを含んでいるデータストレージデバイスにおける電源管理の方法であって、データが前記磁気記憶デバイスから読み出された、あるいは前記磁気記憶デバイスに書き込まれた最も最近の時間から時間間隔を測定することと、予め決められた値を超える前記時間間隔に応じて、前記磁気記憶デバイスの現在の電力消費状態を、より低い電力消費状態に変更することと、を備える。 【選択図】 図４