Detection of disk surface irregularities in data storage devices
First Claim
1. A data storage device (DSD) comprising:
- a disk including a first side for storing data and a second side for storing data;
a first head for reading data from the first side;
a second head for reading data from the second side; and
circuitry configured to;
control the first head to read data from the first side;
generate a first set of variable gain amplifier (VGA) values related to the reading of data from the first side using the first head;
control the second head to read data from the second side;
generate a second set of VGA values related to the reading of data from the second side using the second head;
determine a profile for the disk using the first set of VGA values and the second set of VGA values;
set at least one threshold based on the profile; and
compare the profile to the at least one threshold to detect surface irregularities on the disk.
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Accused Products
Abstract
Detecting surface irregularities on a disk of a data storage device (DSD) includes reading data from a first side of the disk using a first head of the DSD. A first set of variable gain amplifier (VGA) values is generated which is related to the reading of data from the first side using the first head. Data is read from a second side of the disk using a second head of the DSD and a second set of VGA values is generated which is related to the reading of data from the second side using the second head. A profile for the disk is determined using the first set of VGA values and the second set of VGA values. The profile is compared to at least one threshold to detect surface irregularities on the disk.
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Citations
24 Claims
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1. A data storage device (DSD) comprising:
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a disk including a first side for storing data and a second side for storing data; a first head for reading data from the first side; a second head for reading data from the second side; and circuitry configured to; control the first head to read data from the first side; generate a first set of variable gain amplifier (VGA) values related to the reading of data from the first side using the first head; control the second head to read data from the second side; generate a second set of VGA values related to the reading of data from the second side using the second head; determine a profile for the disk using the first set of VGA values and the second set of VGA values; set at least one threshold based on the profile; and compare the profile to the at least one threshold to detect surface irregularities on the disk. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for detecting surface irregularities on a disk of a data storage device (DSD), the method comprising:
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reading data from a first side of the disk using a first head of the DSD; generating a first set of variable gain amplifier (VGA) values related to the reading of data from the first side using the first head; reading data from a second side of the disk using a second head of the DSD; generating a second set of VGA values related to the reading of data from the second side using the second head; determining a profile for the disk using the first set of VGA values and the second set of VGA values; setting at least one threshold based on the profile; and comparing the profile to the at least one threshold to detect surface irregularities on the disk. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification