Справочник Пользователя для Fujitsu MBB2147RC

 

The size of the usable area for storing user data on the HDD (format capacity) varies according to the 
logical data block or the size of the spare sector area.  Table 3.1 lists examples of the format capacity 
when the typical logical data block length and the default spare area are used.  The following is the 
general formula to calculate the format capacity. 

 

[Number of sectors of each zone] = [number of sectors per track 

×

 number of tracks per cell – 

number of alternate spare sectors per cell] 

×

 [number of cells in the zone] 

 

[Formatted capacity] = [total of sectors of all zones] 

÷

 [number of physical sectors in logical block] 

×

 

[logical data block length] 

 

The following formula must be used when the number of logical data blocks are specified with the 
parameter in the MODE SELECT or MODE SELECT EXTENDED command. 

 

[Format capacity] = [logical data block length] 

×

 [number of logical data blocks] 

 

The logical data block length, the maximum logical block address, and the number of the logical data 
blocks can be read out by a READ CAPACITY, MODE SENSE, or MODE SENSE EXTENDED 
command after initializing the disk. 

Model 

Data block length 

User blocks 

Format capacity 

MBB2147RC 287,277,984 

147 GB (*) 

MBB2073RC 

512 

143,638,992 

73.5 GB (*) 

(*)  One gigabyte (GB) = one billion bytes; accessible capacity will be less and actual capacity depends 

on the operating environment and formatting. 

 

Total number of spare sectors is calculated by adding the number of spare sectors in each primary 
cylinder and the number of sectors in the alternate cylinders. 

 
3.2 

 

The HDDs relate a logical data block address to each physical sector at formatting.  Data on the disk 
is accessed in logical data block units.  The initiator specifies the data to be accessed using the logical 
data block address of that data. 

 

 

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