Storage device, control device, and control method
Data access is performed to a storage medium having storage areas each having a data portion in that data is stored and an attached portion attached to the data portion. Each attached portion has a data pattern corresponding to a type of access capability and stores control data used in access to the data portion. At a start of access, a type of access capability corresponding to the data pattern of the control data stored in the attached portion is determined, and access by a head is controlled by a control method corresponding to the determined type.
1 . A storage device that performs access to data in a storage medium, comprising:
a head that executes the access to a storage medium, the storage medium having storage areas, each storage area having a data portion storing the data and an attached portion attached to the data portion, the attached portion storing control data used in the access to the data portion to that the attached portion is attached, and the control data being stored in a data pattern corresponding to a type of an access capability; and
a control section that causes the head to acquire the control data from the attached portion at a start of an access to the storage area to control the access by the head, determines a type of an access capability corresponding to a data pattern of the control data, and controls the access by the head by a control method depending on the determined type.
2 . The storage device according to claim 1 , wherein the attached portion of the storage area is arranged on an upstream side of the data portion in a direction of the access, and the control data expresses a start of the storage area.
3 . The storage device according to claim 1 , wherein the control section positions the head to the storage medium at a precision depending on the access capability, so that the head is caused to execute the access at a recording density depending on the access capability.
4 . The storage device according to claim 1 , wherein the control section determines a type of the access capability only when the control data is acquired on the head at the beginning.
5 . A control device that controls a head that accesses a storage medium on that a data area in that data is stored and a servo data area attached to the data area are formed, wherein in the servo data area, control data used in the access is stored in a data pattern corresponding to a type of the access capability, and the control device further comprises:
an acquiring section that causes the head to acquire the control data from the servo data area,
a determining section that determines a type of access capability corresponding to the data pattern of the control data; and
a setting section that performs setting corresponding to the type of access capability determined by the determining section to a circuit attached to the head and used in recording and/or reproducing.
6 . The control device according to claim 5 , wherein the control data is a servo mark or a gray code.
7 . The control device according to claim 5 , wherein the access capability is a capability depending on a recording capacity of the storage medium or a recording density of the storage medium.
8 . A control method that controls a head that accesses a storage medium on that a data area storing data and a servo data area attached to the data area are formed, wherein in the servo data area, control data used in the access is stored in a data pattern corresponding to a type of access capability, and the control data method further comprises:
an acquiring step that causes the head to acquire the control data from the servo data area,
a determining step that determines a type of the access capability corresponding to the data pattern of the control data, and
a setting step that performs setting corresponding to the type of the access capability determined by the determining section to a circuit attached to the head and used in recording and/or reproducing.
9 . The control method according to claim 8 , wherein the control data is a servo mark or a gray code.
10 . The control method according to claim 8 , wherein the access capability is a capability depending on a recording capacity of the storage medium or a recording density of the storage medium.