Format Capacity; Logical Data Block Addressing; Table 3.1 Format Capacity - Fujitsu MAX3147NC Maintenance Manual

3.1.5

Format capacity

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 is 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 medium.
Model
MAX3147NC/NP
MAX3073NC/NP
MAX3036NC/NP
Note:
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

Logical Data Block Addressing

Independently of the physical structure of the disk drive, the HDD adopts the logical data block
addressing as a data access method on the disk medium. The HDD relates a logical data block
address to each physical sector at formatting. Data on the disk medium is accessed in logical data
block units. The initiator specifies the data to be accessed using the logical data block address of
that data.
The logical data block addressing is a function whereby individual data blocks are given addresses
of serial hexadecimal numbers in each drive.
3-8
Table 3.1 Format capacity
Data block length User blocks
287,277,984
512 143,638,992
71,819,496
Format capacity (GB)
147.0 (*)
73.5 (*)
36.7 (*)
(*) 1GB=1,000,000,000 bytes
C141-E229