Fujitsu MAV2036RC Manual Do Utilizador

3-10 

C141-E219 

 

Information of the defect location on the disk is managed by the defect list.  The following are defect 
lists which the HDD manages. 

•  P list (Primary defect list):  This list consists of defect location information available at the disk 

drive shipment and is recorded in a system space.  The defects in this list are permanent, so the 
INIT must execute the alternate block allocation using this list when initializing the disk. 

•  D list (Data defect list):  This list consists of defect location information specified in a FORMAT 

UNIT command by the INIT at the initialization of the disk.  This information is recorded in the 
system space of the disk drive as the G list.  To execute the alternate block allocation, the 
FORMAT UNIT command must be specified. 

•  G list (Growth defect list):  This list consists of defective logical data block location information 

specified in a REASSIGN BLOCKS command by the INIT, information on defective logical data 
blocks assigned alternate blocks by means of the HDD automatic alternate block allocation, 
information specified as the D list, and information generated as the C list.  They are recorded in 
the system space on the disk drive. 

 

The INIT can read out the contents of the P and G lists by the READ DEFECT DATA command. 

 
3.3.2 

 

The alternate data block is allocated to a defective data block (= sectors) in defective sector units by 
means of the defect management method inside the HDD. 

 

The INIT can access all logical data blocks in the user space, as long as there is no error. 

 

Spare sectors to which alternate blocks are allocated can be provided in "alternate cylinders".  See 
Subsection 3.1.2 for details. 

 

The INIT can specify the size and area for spare sectors by the MODE SELECT command at the 
time of the initialization of the disk. 

 

Both of the following are applicable to the alternate block allocation. 

•  Sector slip treatment:  Defective sectors are skipped and the logical data block corresponding to 

those sectors is allocated to the next physical sectors.  This treatment is made on the same cell as 
the defective sector's and is effective until all spare sectors in that cell are used up. 

•  Alternate sector treatment:  The logical data block corresponding to defective sectors is allocated 

to unused spare sectors in the alternate cylinder. 

 

The alternate block allocation is executed by the FORMAT UNIT command, the REASSIGN 
BLOCKS command, or the automatic alternate block allocation.  Refer to Chapter 4 “Command 
Specifications” and Subsection 5.3.2 “Auto alternate block allocation processing” of the Fibre 
Channel Interface Specifications for details of specifications on these commands.  The logical data 
block is allocated to the next physically continued sectors after the above sector slip treatment is 
made.  On the other hand, the logical data block is allocated to spare sectors which are not physically 
consecutive to the adjacent logical data blocks.  If a command which processes several logical data 
blocks is specified, the IDD processes those blocks in ascending order of logical data block.