System and method to provide a ramp having a location which is transitioning from a first grade to a second grade for removing a read/write head from a media
View Patent ↗Methods to provide a ramp to remove a read/write head connected with a suspension from a media in accordance with the present invention can comprise calculating a grade of one or more surfaces having a plurality of progressively shallower grades. A transition between a steep grade and a less steep grade can occur at a nominal location at which the read/write head is removed from communicative proximity with the media. By shaping a ramp such that it includes a maximum steep grade, a surface of the media can have an optimized data region, potentially increasing the spacing of tracks or alternatively increasing the capacity of the media.
1. A ramp to remove a read/write head connected with a suspension from a media, comprising:
one or more surfaces connected with a resting portion such that when the read/write head is removed from the media, the suspension slides across two or more grades before contacting the resting portion;
wherein a transition from a first grade to a second grade occurs at a nominal location at which the read/write head is removed from communicative proximity with the media.
2. The ramp of claim 1 , wherein the two or more grades are progressively shallower.
3. The ramp of claim 1 , further comprising:
an first grade of twelve degrees; and
a second grade of seven degrees.
4. The ramp of claim 1 , wherein the suspension includes a lift tab extending from a distal end of the suspension for contacting the ramp.
5. The ramp of claim 1 , further comprising:
a detent disposed on a flat portion, the detent being adapted to retain the suspension.
6. The ramp of claim 1 , wherein a leading edge of the one or more surfaces is substantially blunt.
7. A ramp to remove a read/write head connected with a suspension from a media, comprising:
a first portion having a first grade;
a second portion connected with the first portion, the second portion having a second grade;
a flat portion connected with the second portion and adapted to allow the suspension to remain substantially stationary; and
wherein a transition from the first grade to the second grade occurs at a nominal location at which the read/write head is removed from communicative proximity with the media.
8. The ramp of claim 7 , wherein the first grade is steeper than the second grade.
9. The ramp of claim 7 , further comprising:
a detent within the flat portion, the detent being adapted to retain the suspension.
10. The ramp of claim 7 , wherein the first grade is twelve degrees.
11. The ramp of claim 7 , wherein the second grade is seven degrees.
12. The ramp of claim 7 , wherein the suspension includes a lift tab extending from a distal end of the suspension for contacting the ramp.
13. The ramp of claim 7 , wherein a leading edge of the one or more surfaces is substantially blunt.
14. A ramp to remove a read/write head connected with a suspension from a media, comprising:
a sloped portion having a continuously regressive grade; and
a flat portion connected with the sloped portion and adapted to allow the suspension to remain substantially stationary;
wherein the grade of the sloped portion has regressed at or below a low grade at a nominal location at which the read/write head is removed from communicative proximity with the media.
15. The ramp of claim 14 ,
wherein the sloped portion has an initial grade of twelve degrees; and
wherein the sloped portion has a low grade of seven degrees.
16. The ramp of claim 14 , wherein the suspension includes a lift tab extending from a distal end of the suspension for contacting the ramp.
17. The ramp of claim 14 , further comprising:
a detent within the flat portion, the detent being adapted to retain the suspension.
18. The ramp of claim 14 , wherein a leading edge of the one or more surfaces is substantially blunt.
19. A ramp to remove a read/write head connected with a suspension from a media, the ramp being positioned over the surface of the media and having a graded portion and a parking portion, wherein the improvement includes:
the graded portion includes a first grade and a second grade; and
wherein a transition from the first grade to the second grade occurs at a nominal location at which the read/write head is removed from communicative proximity with the media.
20. A system for storing and retrieving information, comprising:
a housing;
a disk connected with the housing;
a rotary actuator connected with the housing, the rotary actuator including:
an arm;
a suspension connected with the arm, the suspension being adapted to apply a spring force to a surface of the disk;
a slider connected with the suspension; and
a read/write head disposed on the slider; and
a ramp including:
a first portion having a first grade;
a second portion connected with the first portion, the second portion having a second grade;
a flat portion connected with the second portion and adapted to allow the suspension to remain substantially stationary; and
wherein a transition from the first grade to the second grade occurs at a nominal location at which the read/write head is removed from communicative proximity with the media.
21. A system for storing and retrieving information, comprising:
a housing;
a disk connected with the housing;
a rotary actuator connected with the housing, the rotary actuator including:
an arm;
a suspension connected with the arm, the suspension being adapted to apply a spring force to a surface of the disk;
a slider connected with the suspension; and
a read/write head disposed on the slider; and
a ramp including:
a first portion having a first grade;
a second portion connected with the first portion, the second portion having a second grade;
a flat portion connected with the second portion and adapted to allow the suspension to remain substantially stationary; and
wherein a transition from the first grade to the second grade occurs at a nominal location at which the read/write head is removed from communicative proximity with the media.
22. A system for storing and retrieving information, comprising:
a housing;
a disk connected with the housing;
a rotary actuator connected with the housing, the rotary actuator including:
an arm;
a suspension connected with the arm, the suspension being adapted to apply a spring force to a surface of the disk;
a slider connected with the suspension; and
a read/write head disposed on the slider; and
a ramp including:
a sloped portion having a continuously regressive grade; and
wherein the grade of the sloped portion has regressed at or below a low grade at a nominal location at which the read/write head is removed from communicative proximity with the media.
23. A method for removing a read/write head connected with a suspension from communication with a disk, the suspension being connected with a rotary actuator, comprising:
pivoting the rotary actuator so that the suspension contacts a ramp having one or more surfaces connected with a flat portion such that as the rotary actuator pivots, the suspension slides across two or more grades before contacting the flat portion;
transition from a first grade to a second grade at a nominal location at which the read/write head is removed from communicative proximity with the media; and
positioning the rotary actuator such that the suspension rests in a detent disposed on the flat portion.
24. A method to determine a shape of a ramp for a hard disk drive, comprising:
calculating a dissipation power remaining after a sudden power loss to the hard disk drive;
calculating a flat-to-park power needed for a ramp having a flat portion of a fixed flat length;
calculating a second-to-flat power needed for a ramp having a second portion of a fixed second grade and second length;
calculating a first-to-second power by subtracting the flat-to-park power and second-to-flat power from the dissipation power;
calculating a maximum first grade from the first-to-second power; and
calculating a first length from the first grade.