1. A magnetic disk drive comprising:
a headslider mounted to a magnetic head;
a ramp on which the headslider is unloaded;
a magnetic disk on which a loadunload area and a data area are defined, each of the loadunload area and the data area including data sectors; and
a controller to assign address numbers as a logical block address to each data sector in the loadunload area, the address numbers being inferior in addressing assign order to each address number of the logical block address assigned to each data sector in the data area.
2. The magnetic disk drive according to claim 1, wherein:
the addressing assign order becomes inferior on an ascending order according to the address numbers, and the controller assigns an address number that is larger than a maximum value of address numbers of data sectors in the data area, to each data sector in the loadunload area as the logical block address.
3. The magnetic disk drive according to claim 1, wherein:
the addressing assign order becomes inferior on an ascending order according to the address numbers, and the controller assigns a maximum value of all of the address numbers that are assigned to all data sectors on the magnetic disk, to a data sector in the loadunload area as the logical block address.
4. The magnetic disk drive according to claim 3, wherein:
the maximum value of the address numbers is assigned to a data track that is located on the outermost circumferential side or the innermost circumferential side among available data tracks that are defined in the loadunload area.
5. The magnetic disk drive according to claim 1, wherein:
the loadunload area and the data area are defined so that the number of servo tracks written to the loadunload area ranges from 9% to 12% of the total number of servo tracks written to the magnetic disk.
6. The magnetic disk drive according to claim 1, wherein:
an alternate sector to which a data sector of the loadunload area is reassigned is formed in the loadunload area.
7. The magnetic disk drive according to claim 1, wherein:
when data is written to a data sector in the loadunload area, the data sector having no read hard error, the controller performs write verification.
8. The magnetic disk drive according to claim 1, wherein:
when data is written to a data sector in the loadunload area, the controller writes the same data to another data sector in the loadunload area.
9. The magnetic disk drive according to claim 1, wherein:
the controller executes error correction code offline correction of an error recovery procedure for data sectors in the loadunload area earlier than for data sectors in the data area.
10. The magnetic disk drive according to claim 1, wherein:
after a read hard error occurs in a data sector of the loadunload area, upon receiving a command to write data to the data sector is received, the controller performs reassignment to an alternate sector automatically instead of writing the data to the data sector in question.
11. The magnetic disk drive according to claim 1, wherein:
the controller executes reassignment automatically for data sectors in the loadunload area earlier than for data sectors in the data area, the reassignment being executed when a read error is recovered by a specific step of error recovery procedure.
12. A method for manufacturing a magnetic disk drive, the magnetic disk drive including a head support mechanism having a lift tab and supporting a headslider; a magnetic disk; and a ramp, the method comprising:
writing servo data to the magnetic disk to define data sectors;
defining a loadunload area and a data area on the magnetic disk;
writing test data to data sectors in the loadunload area;
reading the test data to detect a read error, and then performing defect registration of the data sector of the loadunload area; and
assigning an address number as a logical block address to each data sector in the loadunload area in such a manner that the addressing order of addressing data sectors in the loadunload area by host equipment becomes later than the addressing order of addressing data sectors in the data area.
13. The manufacturing method according to claim 12, wherein:
writing servo data includes writing servo data in a self-servo write method from the innermost circumferential side of the magnetic disk up to a position at which the lift tab touches the ramp.
14. The manufacturing method according to claim 12, wherein:
writing test data includes a step of repeating loadingunloading of the headslider fromto the ramp, the number of times loadingunloading is repeated ranging from 7,000 times to 13,000 times.
15. The manufacturing method according to claim 12, wherein:
performing the defect registration includes setting a criterion of defect identification for data sectors in the loadunload area at a value lower than a value for data sectors in the data area.
16. The manufacturing method according to claim 12, further comprising writing the test data to the data area,
wherein detecting a read error includes, in comparison with the number of symbols of an error correction code at the time of reading the test data from each data sector in the data area, making the number of symbols of the error correction code at the time of reading the test data from each data sector in the loadunload area smaller.
17. A magnetic disk drive comprising:
a headslider mounted to a magnetic head;
a ramp into which the headslider withdraws;
a magnetic disk that includes a plurality of cylinders ranging from an innermost circumferential cylinder to an outermost circumferential cylinder, the cylinders being defined over the whole recording surfaces of the magnetic disk, a plurality of data sectors being defined in each of the cylinders; and
a controller that, to a data sector located between a specific cylinder selected from among the plurality of cylinders and the outermost circumferential cylinder, assigns as a logical block address an address number whose order of addressing by host equipment is later than the order of addressing of an address number as a logical block address assigned to a data sector located between the specific cylinder and the innermost circumferential cylinder.
18. The magnetic disk drive according to claim 17, wherein:
the controller assigns, as a logical block address, an address number to each data sector in such a manner that the order of addressing the each data sector by host equipment becomes later in order of data tracks formed in lines from the specific cylinder towards the innermost circumferential cylinder.
19. The magnetic disk drive according to claim 17, wherein:
the controller partitions a plurality of cylinders defined between the specific cylinder and the innermost circumferential cylinder into a plurality of zones, and assigns as a logical block address an address number to each data sector included in each of the zones in such a manner that the order of addressing each data sector included in an inside zone by the host equipment becomes later than the order of addressing each data sector included in an outside zone by the host equipment.
20. The magnetic disk drive according to claim 17, wherein:
a loadunload area and a data area are defined on the magnetic disk, and the controller selects the specific cylinder as a cylinder that is defined at a position closest to the loadunload area among cylinders included in the data area.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A sheet feeding apparatus, in which a sheet accommodating unit is demountably provided in an apparatus body, the sheet accommodating unit having a sheet accommodating member, a lifting plate pivotably provided in the sheet accommodating member, and a pushing member configured to push the lifting plate toward a sheet feeding unit, the sheet feeding apparatus comprising:
a locking mechanism configured to perform regulation of the lifting plate at a position to which the lifting plate descends against a pushing force of the pushing member, the locking mechanism including a pivotable locking member configured to regulate the lifting plate and a pivotable lock releasing lever configured to turn the locking member; and
a lock release member configured to release the regulation of the lifting plate by the locking mechanism in response to mounting of the sheet accommodating unit in the apparatus body,
wherein when the sheet accommodating unit is mounted in the apparatus body, the lock releasing lever is turned by the lock release member and turns the locking member to release the regulation of the lifting plate, and
wherein when the sheet accommodating unit is drawn out of the apparatus body, the lock releasing lever is turned by the lock release member independently in a state in which the locking member regulates the lifting plate.
2. The sheet feeding apparatus according to claim 1, wherein the sheet accommodating member includes a regulation unit configured to regulate, when the locking member locks the lifting plate, turning of the locking member caused by the pushing force of the pushing member,
wherein the locking member includes a catching part configured to catch the lifting plate, and an abutting part configured to abut when the lifting plate is locked, against the regulation unit of the apparatus body, and
wherein the lock releasing lever includes an engaging part configured to engage, when moved in a lock releasing direction, with the locking member.
3. The sheet feeding apparatus according to claim 2, wherein the locking mechanism further includes:
a first pushing member configured to push the abutting part of the locking member in a direction in which the abutting part of the locking member abuts against the regulation unit; and
a second pushing member configured to push the lock releasing lever in a direction in which the engaging part of the lock releasing lever is engaged with the locking member.
4. The sheet feeding apparatus according to claim 3, wherein the first pushing member and the second pushing member are constituted by a same pushing member.
5. The sheet feeding apparatus according to claim 1, wherein the locking member is provided below the lifting plate and at a central part in a width direction perpendicular to a sheet feeding direction of the lifting plate.
6. The sheet feeding apparatus according to claim 1, wherein the apparatus body includes a guide member adapted to lower, when the sheet accommodating unit is drawn out, the lifting plate against the pushing force of the pushing member to a position at which the lifting plate is locked by the locking mechanism.
7. An image forming apparatus including a sheet feeding apparatus in which a sheet accommodating unit is demountably provided, the sheet accommodating unit having a sheet accommodating member, a lifting plate pivotably provided in the sheet accommodating member, and a pushing member configured to push the lifting plate toward a sheet feeding unit, the image forming apparatus also including an image forming unit configured to form an image on a sheet fed from the sheet feeding apparatus, the image forming apparatus comprising:
a locking mechanism configured to perform regulation of the lifting plate at a position to which the lifting plate descends against a pushing force of the pushing member, the locking mechanism including a pivotable locking member configured to regulate the lifting plate, and a pivotable lock releasing lever configured to turn the locking member; and
a lock release member configured to release the regulation of the lifting plate by the locking mechanism in response to mounting of the sheet accommodating unit in the apparatus body,
wherein when the sheet accommodating unit is mounted in the apparatus body, the lock releasing lever abuts against the lock release member and turns to cause the locking member to turn to release the regulation of the lifting plate, and
wherein when the sheet accommodating unit is drawn out of the apparatus body, the lock releasing lever is turned by the lock release member independently in a state in which the locking member regulates the lifting plate.