Hdd control apparatus
First Claim
1. A hard disk drive (HDD) control apparatus, comprising:
- a means for connecting the HDD control apparatus to a navigation system;
a means for connecting the HDD control apparatus to an HDD;
a means for connecting the HDD control apparatus to a second system;
a decompression unit that decompresses data read from the HDD and transmits the resultant data to the second system; and
a control unit that writes or reads data in or from the HDD in response to a command sent from the navigation system, that reads data from the HDD in response to a command sent from the second system, and instructs the decompression unit to decompress the data and transmit the resultant data to the second system, and that when the command to access the HDD is issued concurrently from the navigation system and the second system alike, arbitrates the commands through time sharing.
1 Assignment
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Accused Products
Abstract
A hard disk drive (HDD) included in an HDD navigation system is shared with the second system without the necessity of modifying the navigation system. An HDD control unit 1 is connected to each of a navigation system 2, an HDD 3, and the second system 4. Data read from the HDD is held in a buffer RAM 11. For transfer of data to the second system, a decompression unit 13 decompresses the data and transmits the resultant data. When the command to access the HDD is issued concurrently from the navigation system and second system alike, the commands are arbitrated through time sharing. Transfer to the second system is executed as a top priority, whereby a break in data, such as in audio data, is prevented.
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Citations
13 Claims
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1. A hard disk drive (HDD) control apparatus, comprising:
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a means for connecting the HDD control apparatus to a navigation system;
a means for connecting the HDD control apparatus to an HDD;
a means for connecting the HDD control apparatus to a second system;
a decompression unit that decompresses data read from the HDD and transmits the resultant data to the second system; and
a control unit that writes or reads data in or from the HDD in response to a command sent from the navigation system, that reads data from the HDD in response to a command sent from the second system, and instructs the decompression unit to decompress the data and transmit the resultant data to the second system, and that when the command to access the HDD is issued concurrently from the navigation system and the second system alike, arbitrates the commands through time sharing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hard disk drive (HDD) control apparatus, comprising:
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a means for connecting the HDD control apparatus to a navigation system;
a means for connecting the HDD control apparatus to an HDD;
a means for connecting the HDD control apparatus to an audiovisual (AV) system;
a decompression unit that decompresses data read from the HDD, and transmits the resultant data to the AV system;
a control unit that writes or reads data in or from the HDD in response to a command sent from the navigation system, that reads data from the HDD in response to a command sent from the AV system, and instructs the decompression unit to decompress the data and transmit the data to the AV system, and that when the command to read data from the HDD is issued concurrently from the navigation system and AV system alike, suspends reading of data concerning the navigation system and reads compressed data concerning the AV system. - View Dependent Claims (12, 13)
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Specification