Method and apparatus for operating vehicle mounted disk drive storage device

• US 6,546,456 B1
• Filed: 09/08/2000
• Issued: 04/08/2003
• Est. Priority Date: 09/08/2000
• Status: Expired due to Term

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: International Business Machines Corporation
• Inventors: Smith, Gordon James, Van Leeuwen, George Willard
• Primary Examiner(s): Gossage, Glenn
• Application Number:
  US09/657,879
• Time in Patent Office: 942 Days
• Field of Search: 711/112, 711/118, 711/170, 711/113, 710/52, 710/56, 714/6, 713/1, 713/2
• US Class Current: 711/112
• CPC Class Codes: G11B 19/02 Control of operating function, e.g. switching from recording to reproducing
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 2020/1062 Data buffering arrangements, e.g. recording or playback buffers

Abstract

A system and method for operating a motor vehicle based data processing system having at least one rotating magnetic disk drive data storage device are disclosed. Sequential presentation data stored on a rotating magnetic disk drive installed in a motor vehicle or automobile is buffered and the context is saved in sufficient amount to transcend a time interval of data unavailability when a disk drive is initially powered up. When the vehicle is shut off and the drive is powered down, the data to be presented in the immediate future is saved in a non-volatile buffer. The amount of data saved in the buffer is sufficient to span the time interval that it takes the disk drive to power up and become data accessible. Preferably, the buffer is a general purpose buffer for use by the vehicle'"'"'s on-board computer system, the amount of memory allocated to the buffer varying with the present state of the vehicle and disk drive, and other parameters. The disk drive may be used, among other things, for storing and retrieving multimedia data such as digitized music and/or video.

Claims

1. A motor vehicle based data processing system, comprising:

a rotating magnetic fixed disk drive data storage device;

a storage buffer, said storage buffer comprising semiconductor memory, said buffer receiving data from said disk drive data storage device;

a controller controlling the operation of said disk drive data storage device, said controller retrieving sequentially presented data from said buffer for use during a time interval in which said disk drive data storage device is being powered up and data is not yet accessible from said disk drive data storage device;

wherein said storage buffer is contained in a random access memory of a fixed size having an address space, and wherein a portion of said address space is allocated to said storage buffer to store said sequentially presented data, said portion being of a variable size;

wherein a first portion of said address space is allocated to storing said sequentially presented data when the motor vehicle is operating, and a second portion of said address space is allocated to storing said sequentially presented data when the motor vehicle is not operating, said second portion being larger than said first portion.

2. The motor vehicle based data processing system of claim 1, wherein said controller comprises a programmable processor executing executable instructions of a control program, said executable instructions being executed from said random access memory.

3. The motor vehicle based data processing system of claim 1, wherein the size of the variable sized portion of said address space allocated to store said sequentially presented data depends on an estimated time to access data stored on said rotating magnetic fixed disk drive data storage device.

4. The motor vehicle based data processing system of claim 1, wherein the size of the variable sized portion of said address space allocated to store said sequentially presented data depends on temperature.

5. The motor vehicle based data processing system of claim 1, wherein said sequentially presented data is multimedia data presented for the entertainment of an occupant of the motor vehicle.

6. The motor vehicle based data processing system of claim 1, wherein said controller further stores a playlist data structure in said semiconductor memory, said playlist data structure specifying a fixed order of presentation of multiple files of said sequentially presented data.

7. A method of operating a motor vehicle based data processing system having at least one rotating magnetic disk drive data storage device, comprising the steps of:

allocating a variable sized portion of a fixed size random access semiconductor memory of said motor vehicle based data processing system for use as a buffer;

reading data for sequential presentation from said rotating magnetic disk drive data storage device into said buffer;

deactivating said rotating magnetic disk drive data storage device after said reading step;

detecting a demand for said data for sequential presentation while said rotating magnetic disk drive data storage device is deactivated;

reactivating said rotating magnetic disk drive data storage device responsive to said step of detecting a demand, said reactivating step occupying a time interval during which data is unavailable from said rotating magnetic disk drive data storage device; and

sequentially presenting said data for sequential presentation from said buffer during said time interval;

wherein a first portion of said random access semiconductor memory is allocated to said buffer when the motor vehicle is operating, and a second portion of said random access semiconductor memory is allocated to said buffer when the motor vehicle is not operating, said second portion being larger than said first portion.

8. The method of claim 7, wherein the size of said variable sized portion of said random access semiconductor memory allocated to said buffer depends on an estimated time to access data stored on said rotating magnetic disk drive data storage device.

9. The method of claim 7, wherein the size of said variable sized portion of said random access semiconductor memory allocated to said buffer depends on temperature.

10. The method of claim 7, wherein said data for sequential presentation is multimedia data presented for the entertainment of an occupant of the motor vehicle.

11. The method of claim 7, further comprising the step of maintaining a playlist data structure in said random access semiconductor memory, said playlist data structure specifying a fixed order of presentation of multiple files of said data for sequential presentation.

12. A program product for controlling the operation of a motor vehicle based data processing system, said data processing system having at least one rotating magnetic disk drive data storage device, said program product comprising:

a plurality of processor executable instructions recorded on signal-bearing media, wherein said instructions, when executed by at least one programmable processor of said motor vehicle based data processing system, cause the system to perform the steps of;

allocating a variable sized portion of a fixed size random access semiconductor memory of said motor vehicle based data processing system for use as a buffer;

reading data for sequential presentation from said rotating magnetic disk drive data storage device into said buffer;

deactivating said rotating magnetic disk drive data storage device after said reading step;

detecting a demand for said data from sequential presentation while said rotating magnetic disk drive data storage device is deactivated;

reactivating said rotating magnetic disk drive data storage device responsive to said step of detecting a demand, said reactivating step occupying a time interval during which data is unavailable form said rotating magnetic disk drive data storage device; and

sequentially presenting said data for sequential presentation from said buffer during said time interval;

wherein a first portion of said random access semiconductor memory is allocated to said buffer when the motor vehicle is operating, and a second portion of said random access semiconductor memory is allocated to said buffer when the motor vehicle is not operating, said second portion being larger than said first portion.

13. The program product of claim 12, wherein the size of the variable sized portion of said random access semiconductor memory allocated to said buffer depends on an estimated time to access data stored on said rotating magnetic disk drive data storage device.

14. The program product of claim 12, wherein the size of said variable sized portion of said random access semiconductor memory allocated to said buffer depends on temperature.

15. The program product of claim 12, wherein said data for sequential presentation is multimedia data presented for the entertainment of an occupant of the motor vehicle.

16. The program product of claim 12, wherein said processor executable instructions further cause the system to perform a step of maintaining a playlist data structure in said random access semiconductor memory, said playlist data structure specifying a fixed order of presentation of multiple files of said data for sequential presentation.