Fujitsu MBB2147RC 用户手册

(1) User 

space 

 

The user space is a storage area for user data.  The data format on the user space (the length of data 
block and the number of data blocks) can be specified with the MODE SELECT or MODE SELECT 
EXTENDED command. 

 

The user can also specify the number of logical data blocks to be placed in the user space with the 
MODE SELECT or MODE SELECT EXTENDED command.  When the number of logical data 
blocks is specified, as many cylinders as required to place the specified data blocks are allocated in 
the user space. 

 

A number starting with 0 is assigned to each cylinder required in the user space in ascending order.  
If the number of cylinders do not reach the maximum, the rest of the cylinders will not be used. 

 

Always 10 cylinders are located at the end of the last zone in the user space as an alternate cylinder.  
Alternate cylinders will be used for alternate blocks.  See Subsections 3.1.2 and 3.3.2 for details. 

 
(2) 

Internal test space 

 

The Internal test space is an area for diagnostic purposes only and its data block length is always 
512Byte.  The Internal test space consists of 8 cylinders and outer-most cylinder is always assigned 
(cylinder 

−

223 to 

−

230).  The user cannot change the number of cylinders in the Internal test space or 

their positions. 

 
(3) System 

space 

 

The system space is an area for exclusive use of the HDDs itself and the following information are 
recorded. 

• 

Defect list (P list and G list) 

• 

MODE SELECT parameter (saved value) 

• 

Statistical information (log data) 

• 

Controller control information 

 
 

The above information is duplicated in several different locations for safety. 

 

The system space is also called SA space. 

C141-E257 

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