Allowing fast data zone switches on data storage devices
View Patent ↗Some embodiments described herein are directed to reducing or eliminating latency caused by data zone switches in a rotating magnetic storage device. More specifically, some embodiments described herein are directed to storing parameters associated with different zones in a parameter register in response to one or more received commands.
1. A method for reading data from a storage device comprising a head and a storage medium, the method comprising:
initiating processing of a first read command from a host device, wherein data associated with the first read command is in a first location on the storage medium;
navigating the head to the first location;
retrieving the data associated with the first read command from the first location;
decoding the data associated with the first read command using a first parameter, wherein the first parameter is associated with the first location;
prior to completing decoding the data associated with the first read command:
initiating processing of a second read command from the host device, wherein data associated with the second read command is in a second location;
navigating the head to the second location;
retrieving the data associated with the second read command; and
associating the data associated with the second read command with a second parameter; and
initiating decoding of the data associated with the second read command using the second parameter.
2. The method of claim 1 , wherein the first parameter is different than the second parameter.
3. The method of claim 1 , wherein the first parameter is a first decoder setting associated with the first location and the second parameter is a second decoder setting associated with the second location.
4. The method of claim 1 , wherein the first location is in a first data zone on the storage medium and second location is in a second data zone on the storage medium.
5. The method of claim 4 , wherein the first data zone has a first frequency setting and a first density and the second data zone has a second frequency setting and a second density.
6. The method of claim 1 , further comprising storing the data associated with the second read command in a memory of a decoder.
7. The method of claim 6 , further comprising storing a reference to the second parameter in the memory of the decoder.
8. The method of claim 1 , wherein the data associated with the first read command and the data associated with the second read command are decoded by a low density parity check decoder.
9. The method of claim 1 , wherein the second parameter is stored in a register of a read channel of the storage device.
10. The method of claim 1 , further comprising:
prior to completing decoding the data associated with the first read command:
receiving a third read command from the host device, wherein data associated with the third read command is in a third location;
navigating the head to the third location;
retrieving the data associated with the third read command; and
associating the data associated with the third read command with a third parameter.
11. The method of claim 1 , further comprising:
while decoding the data associated with the first read command:
receiving a third read command from the host device, wherein data associated with the third read command is in the first location;
navigating the head to the first location;
retrieving the data associated with the third read command; and
associating the data associated with the third read command with the first parameter.
12. A method for writing data to a storage device comprising a head and a storage medium, the method comprising:
initiating processing of a first write command;
navigating the head to a first location on the storage medium;
writing data associated with the first write command at the first location using a first parameter;
prior to completing writing the data associated with the first write command at the first location:
initiating processing of a second write command, wherein the second write command is associated with a second parameter;
upon completing the writing of the data associated with the first write command at the first location:
navigating the head to a second location on the storage medium; and
writing the data associated with the second write command from an auxiliary storage location to the second location using the second parameter.
13. The method of claim 12 , wherein the first parameter is a first frequency setting associated with the first location and the second parameter is a second frequency setting associated with the second location.
14. The method of claim 12 , wherein the first parameter is different than the second parameter.
15. The method of claim 12 , wherein the first location is in a first data zone on the storage medium and second location is in a second data zone on the storage medium.
16. The method of claim 12 , wherein the data associated with the second write command is stored in an auxiliary storage location of the storage device using the first parameter.