Remapping tracks for management of adjacent track interference
A method includes monitoring operations performed on tracks in a main storage area of a disc, and identifying a track of the tracks in the main storage area susceptible to adjacent track interference (ATI). When a track is identified, the identified track or an adjacent track which contributes to ATI of the identified track is remapped to an ATI safe zone of the disc having a tracks per inch (TPI) density lower than a TPI density of the main storage area.
1. A method, comprising:
monitoring operations performed on tracks in a main storage area of a disc;
identifying a track of the tracks in the main storage area susceptible to adjacent track interference (ATI);
remapping the identified track or an adjacent track which contributes to ATI of the identified track to an ATI safe zone of the disc having a tracks per inch (TPI) density lower than a TPI density of the main storage area; and
when the identified track is remapped to the ATI safe zone, remapping the identified track back to its original location in the main storage area when a write frequency to the adjacent track in the main storage area falls below a threshold write frequency.
2. The method of claim 1 , wherein identifying a track of the tracks in the disc comprises identifying based on a threshold scan frequency of the track.
3. The method of claim 1 , wherein remapping to an ATI safe zone comprises remapping to one of a safe zone at an inner diameter of the disc or a safe zone at an outer diameter of the disc.
4. A method, comprising:
monitoring tracks in a hard disc drive (HDD) for scan frequency, the scan frequency being a frequency at which the tracks are scanned as part of a data loss avoidance process;
designating a track in a main storage area of the HDD as an adjacent track interference (ATI) hot track when its scan frequency exceeds a predetermined scan frequency threshold; and
remapping the designated ATI hot track to an ATI safe zone having tracks with lower susceptibility to ATI.
5. The method of claim 4 , wherein remapping is performed on a next scan of the designated ATI hot track after its designation as an ATI hot track.
6. The method of claim 4 , and further comprising designating a track in an ATI safe zone as an ATI cold track when its write frequency drops below a predetermined write frequency.
7. The method of claim 6 , and further comprising remapping the designated ATI cold track to the main storage area.
8. The method of claim 7 , wherein remapping is performed within a media repair task.
9. The method of claim 4 , and further comprising:
determining when the ATI safe zone is at a threshold level of fullness;
when the ATI safe zone is at or above the threshold level of fullness, determining whether tracks in the ATI safe zone are at a write frequency lower than a current designated ATI hot track; and
before remapping the current designated ATI hot track to the ATI safe zone, remapping a track in the ATI safe zone that is at a write frequency lower than the current designated ATI hot track to the main storage area.
10. The method of claim 4 , wherein remapping to an ATI safe zone comprises remapping to a safe zone at an inner diameter of a disc of the HDD.
11. The method of claim 4 , wherein remapping to an ATI safe zone comprises remapping to a safe zone at an outer diameter of a disc of the HDD.
12. The method of claim 4 , wherein remapping to an ATI safe zone comprises remapping to at least one of a safe zone at an inner diameter of a disc of the HDD or a safe zone at an outer diameter of a disc of the HDD.
13. An apparatus, comprising:
a data storage medium comprising a plurality of tracks, including tracks in a main storage area having a first tracks per inch density, and tracks in an ATI safe zone having data-free tracks interspersed between write-permitted tracks; and
a controller communicatively coupled to the data storage medium, the controller configured to:
monitor operations performed on the tracks in the main storage area;
identify a track of the tracks in the main storage area susceptible to adjacent track interference (ATI); and
remap the identified track or an adjacent track which contributes to ATI of the identified track to one of the write-permitted tracks in the ATI safe zone.
14. The apparatus of claim 13 , wherein the controller is further configured to identify a track of the tracks susceptible to ATI based on a threshold scan frequency of the track.
15. The apparatus of claim 13 , wherein the data storage medium comprises at least one disc, and wherein the tracks in the ATI safe zone are at an outer diameter of the data storage medium disc.
16. The apparatus of claim 13 , wherein the data storage medium comprises at least one disc, and wherein the tracks in the safe zone are at an inner diameter of the data storage medium disc.
17. The apparatus of claim 13 , wherein the controller is further configured to, when the identified track is remapped to the write-permitted track in the ATI safe zone, remap the identified track back to its original location in the main storage area when a write frequency to the adjacent track in the main storage area falls below a threshold write frequency.
18. The apparatus of claim 13 , wherein the controller is further configured to, when the adjacent track is remapped to the write-permitted track in the ATI safe zone, remap the adjacent track back to its original location in the main storage area when a write frequency to the adjacent track in the ATI safe zone falls below a threshold write frequency.
19. A method, comprising:
monitoring operations performed on tracks in a main storage area of a disc;
identifying a track of the tracks in the main storage area susceptible to adjacent track interference (ATI);
remapping the identified track or an adjacent track which contributes to ATI of the identified track to an ATI safe zone of the disc having a tracks per inch (TPI) density lower than a TPI density of the main storage area; and
when the adjacent track is remapped to the ATI safe zone, remapping the adjacent track back to its original location in the main storage area when a write frequency to the adjacent track in the ATI safe zone falls below a threshold write frequency.
20. The method of claim 19 , wherein identifying a track of the tracks in the disc comprises identifying based on a threshold scan frequency of the track.
21. The method of claim 19 , wherein remapping to an ATI safe zone comprises remapping to one of a safe zone at an inner diameter of the disc or a safe zone at an outer diameter of the disc.