Disk device
A technology of a magnetic disk device and a magnetic disk, which is applied in the directions of magnetic recording, configuration/installation of recording heads, data recording, etc., and can solve problems such as areas that cannot be used as data areas.
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no. 1 Embodiment approach
[0027] figure 1 It is a diagram showing an example of a schematic configuration of the magnetic disk drive 100 .
[0028] Such as figure 1 As shown, the magnetic disk device 100 includes a disk unit 110 and a control unit 130 . The disk unit 110 includes a magnetic disk 111 , a spindle motor (hereinafter referred to as “SPM”) 112 , a magnetic head 113 , a voice coil motor (hereinafter referred to as “VCM”) 116 , and a preamplifier 117 . The magnetic head 113 has a write head 114 and a read head 115 . In addition, the control unit 130 includes a system on chip (hereinafter referred to as “SOC”) 131 , a servo component (hereinafter referred to as “SVC”) 135 , and a memory 136 . The SOC (control unit) 131 is configured by providing a CPU 132 , a hard disk controller (hereinafter referred to as “HDC”) 133 , and an R / W (read / write) channel 134 as a processing unit on one chip. The memory 136 includes a ROM137 and a RAM138. In addition, the preamplifier 117 and the R / W channel ...
no. 2 Embodiment approach
[0065] Figure 8 It is a diagram showing an example of a schematic configuration of the magnetic disk device 1 .
[0066] Such as Figure 8 As shown, the magnetic disk device 1 includes a disk unit 10 and a control unit 30 . The disk unit 10 includes a magnetic disk 11 , a spindle motor (hereinafter referred to as “SPM”) 12 , a magnetic head 13 , a voice coil motor (hereinafter referred to as “VCM”) 16 , and a preamplifier 17 . The magnetic head 13 has a write head 14 and a read head 15 . In addition, the control unit 30 includes a system on chip (hereinafter referred to as “SOC”) 31 , a servo component (hereinafter referred to as “SVC”) 35 , and a memory 36 . The SOC (control unit) 31 is configured by providing a CPU 32 , a hard disk controller (hereinafter referred to as “HDC”) 33 , and an R / W (read / write) channel 34 as a processing unit on one chip. The memory 36 includes a ROM37 and a RAM38. In addition, the preamplifier 17 and the R / W channel 34 are connected by a pl...
no. 3 Embodiment approach
[0096] The third embodiment differs from the first and second embodiments in that processing when the servo data cannot be read is added. In addition, the same code|symbol is attached|subjected to the same structure as 2nd Embodiment, and detailed description about these structures is abbreviate|omitted.
[0097] Figure 14 It is a flowchart showing an example of data area expansion processing. In addition, since the processing of steps ST101 to ST106 is the same as that of the first embodiment, the processing of additional steps ST201 to ST204 will be described. In addition, the R / W channel 34 receives an instruction from the CPU 32 and sends it to the preamplifier 17 from the R / W channel 34 to execute processing, which is the same as that of the first embodiment.
[0098] When the processing in step ST104 is completed, it is determined whether or not the servo data D2 cannot be read (ST201). If the servo data D2 cannot be read (ST201: NO), that is, if the servo data D2 ha...
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