1. A hard disk drive (HDD) comprising:
at least one rotatable disk;
at least one write element configured for writing data to the disk in isolated tracks and in bands, wherein at least two tracks establish a band; and
at least one HDD controller controlling the write element, the controller using a log-structured file system defining segments, each segment corresponding to at least one of: a respective band, and an isolated track, wherein the log-structured file system uses an error correction code (ECC) block size larger than a physical sector size of the disk.
2. The HDD of claim 1, wherein at least some bands include at least three contiguous tracks.
3. The HDD of claim 1, wherein the write element is configured for perpendicular recording.
4. The HDD of claim 1, wherein the tracks within a band are shingled.
5. (canceled)
6. The HDD of claim 1, wherein the log-structured file system uses a virtual address table (VAT) to implement shingled track writing.
7. The HDD of claim 6, wherein the VAT maps virtual sector locations to actual sector locations.
8. The HDD of claim 6, wherein the VAT is stored on the disk in at least one of a location with non-overlapping tracks where random access writes can be performed, and a region with shingled written bands, using a log structured storage approach.
9. The HDD of claim 6, wherein the HDD is part of a RAID system including a RAID controller, the RAID controller accessing the VAT to remap sectors as required for shingled track writing.
10-25. (canceled)
26. A hard disk drive (HDD) comprising:
at least one rotatable disk;
at least one write element configured for writing data to the disk in isolated tracks and in bands, wherein at least two tracks establish a band; and
at least one HDD controller controlling the write element, the controller using a log-structured file system defining segments, each segment corresponding to at least one of: a respective band, and an isolated track, wherein the tracks within a band are shingled.
27. The HDD of claim 26, wherein the log-structured file system uses an error correction code (ECC) block size larger than a physical sector size of the disk.
28. The HDD of claim 26, wherein at least some bands include at least three contiguous tracks.
29. The HDD of claim 26, wherein the write element is configured for perpendicular recording.
30. The HDD of claim 26, wherein the log-structured file system uses a virtual address table (VAT) to implement shingled track writing.
31. The HDD of claim 30, wherein the VAT maps virtual sector locations to actual sector locations.
32. The HDD of claim 30, wherein the VAT is stored on the disk in at least one of: a location with non-overlapping tracks where random access writes can be performed, and a region with shingled written bands, using a log structured storage approach.
33. The HDD of claim 30, wherein the HDD is part of a RAID system including a RAID controller, the RAID controller accessing the VAT to remap sectors as required for shingled track writing.
34. A hard disk drive (HDD) comprising:
at least one rotatable disk;
at least one write element configured for writing data to the disk in isolated tracks and in bands, wherein at least two tracks establish a band; and
at least one HDD controller controlling the write element, the controller using a log-structured file system defining segments, each segment corresponding to at least one of: a respective band, and an isolated track, wherein the log-structured file system uses a virtual address table (VAT) to implement shingled track writing.
35. The HDD of claim 34, wherein the tracks within a band are shingled.
36. The HDD of claim 34, wherein the log-structured file system uses an error correction code (ECC) block size larger than a physical sector size of the disk.
37. The HDD of claim 34, wherein at least some bands include at least three contiguous tracks.
38. The HDD of claim 34, wherein the write element is configured for perpendicular recording.
39. The HDD of claim 34, wherein the VAT maps virtual sector locations to actual sector locations.
40. The HDD of claim 34, wherein the VAT is stored on the disk in at least one of: a location with non-overlapping tracks where random access writes can be performed, and a region with shingled written bands, using a log structured storage approach.
41. The HDD of claim 34, wherein the HDD is part of a RAID system including a RAID controller, the RAID controller accessing the VAT to remap sectors as required for shingled track writing.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. An information recording apparatus comprising:
a recording unit which irradiates a recording light to a disc on which prepits are formed, detects return light from the disc and outputs return light quantity data;
a data obtaining period determining unit which determines a data obtaining period in which the return light is not affected by the prepit;
a return light quantity data output unit which obtains and outputs the return light quantity data in the data obtaining periods; and
a controller which performs control based on the return light quantity data output from the return light quantity data output unit.
2. The information recording apparatus according to claim 1, wherein the data obtaining period determining unit determines a period other than a period in which the recording unit forms 14T recording mark or 14T space as the data obtaining period.
3. The information recording apparatus according to claim 1, further comprising a prepit detector which detects a period in which the prepit exists based on the return light, wherein the data obtaining period determining unit determines a period other than a period in which the prepit exists as the data obtaining period.
4. The information recording apparatus according to claim 1, wherein the controller comprising:
a determining unit which determines whether a power of the recording light is proper or not based on a level of the return light quantity data at a predetermined timing; and
a power controller which controls the power of the recording light based on a result of a determination by the determining unit.
5. The information recording apparatus according to claim 4, wherein the determining unit determines whether the power of the recording light is proper or not based on an average level which is obtained by averaging the levels of the return light quantity data at a plurality of the predetermined timing.
6. The information recording apparatus according to claim 4, wherein the data obtaining period determining unit determines a period in which the recording unit forms recording marks of 9T to 11T as the data obtaining period.
7. A control method of an information recording apparatus comprising:
a process of irradiating a recording light on a disc on which prepits are formed;
a process of detecting return light quantity from the disc and outputting return light quantity data;
a process of determining a data obtaining period in which the return light is not affected by the prepits;
a process of obtaining and outputting the return light quantity data in the data obtaining period; and
a process of performing control based on the return light quantity data obtained in the data obtaining period.