1.8.2Logical block addressing

The IDD uses logical data block addressing which is not dependent on the disk drive’s physical structure as the method of data access on the disk medium. The IDD makes correspondence between each physical sector and each logical data clock address during formatting. Access to the data on the disk medium is performed in logical data block units and the INIT specifies the logical data block address that is its object during access.

In logical data block addressing, specifying of a data block address is a function which specifies 2 continuous binary numbers for each drive. Furthermore, the INIT can know the logical data block address range in the user space where specification is possible using the READ CAPACITY command.

(1)User space logical block addresses

The top data block in the user space is made logical data block address “0,” then continuous logical data block addresses are allocated to each data block until the last data block in the user space.

The IDD makes cylinder 0, track 0 sector 0 the top logical data block, and allocates subsequent logical data blocks in the order described below to addresses in ascending order.

1)Within the same track, logical data blocks are allocated to sector numbers in ascending order.

2)Within the same cylinder, excluding the final track, succeeding logical data blocks are allocated to the sectors in each track according to 1) in the ascending order of track numbers.

3)Within the same cell, excluding the final track, succeeding logical data blocks are allocated to the sectors in each track according to 1) in the ascending order of track numbers.

4)On the last track inside the same cell, succeeding logical data blocks are allocated to sectors except for spare sectors according to 1).

5)After all the allocation in 1) to 4) is completed within the same cell, succeeding logical data blocks are allocated to the next cell beginning with track 0, according to 1) to 3), and so on to each cell number in ascending order until the last cylinder in each zone (refer to alternate cilinder b-1 in Figure 1.5) in the user space, with the exception of alternate cylinders.

(2)Alternate area

The alternate area in user space (spare sectors within each cylinder and alternate cylinders) are excluded from the abovementioned logical data block addresses. Access to allocated sectors as alternate blocks within the alternate area is performed automatically by the IDD’s defect management (sector slip processing and alternate block processing), so it is not particularly necessary for the user to access the alternate area. Also, data blocks in the alternate area cannot be clearly specified and accessed directly.

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Fujitsu MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES specifications Logical block addressing
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MAN3735, MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES, MAN3367, MAN3184 specifications

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