Logical Data Block Addressing - Fujitsu MAG3182FC SERIES Product Manual

3.2

Logical Data Block Addressing

Independently of the physical structure of the disk drive, the IDD adopts the logical data block
addressing as a data access method on the disk medium. The IDD 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 INIT 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 binaries in each drive.
(1) Block address of user space
The logical data block address number is consecutively assigned to all of the data blocks in the
user space starting with 0 to the first data block.
The IDD treats sector 0, track 0, cylinder 0 as the first logical data block. The data block is
allocated in ascending order of addresses in the following sequence (refer to Figure 3.5):
1) Numbers are assigned in ascending order to all sectors in the same track.
2) By following step 1), numbers are assigned in ascending order of tracks to all sectors in each
track in the same cylinder except the last track.
3) By following step 1), numbers are assigned to all sectors in the last track except the spare
sectors.
4) After completing steps 1) through 3) for the same cylinder, this allocation is repeated from
track 0 in the next cylinder and on to the last cylinder (cylinder p-q in Figure 3.1) except for
the alternate cylinders in ascending order of cylinder numbers.
When the logical data block is allocated, some sectors (track skew and cylinder skew) shown in
Figure 3.5 are provided to avoid waiting for one turn involving head and cylinder switching at
the location where the track or the cylinder is physically switched.
See Subsection 3.3.2 for defective/alternate block treatment and the logical data block allocation
method in case of defective sectors exist on the disk.
(2) Alternate area
Alternate areas in the user space (spare sectors in the cylinder and alternate cylinders) are not
included in the above logical data block addresses. Access to sectors which are allocated as an
alternate block in the alternate area is made automatically by means of IDD sector slip treatment
or alternate block treatment (explained in Subsection 3.3.2), so the user does not have to worry
about accessing the alternate area. The user cannot access with specifying the data block on the
alternate area explicitly.
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