Fujitsu MBC2073RC, MBC2036RC, MBA3300RC, MBA3147RC, MBA3073RC specifications Command Specifications

Command Specifications

−Cautions in specifying the D list

The P List, containing defect position information, is always recorded on the HDD when it is shipped from the factory. Also, information on defect positions for which alternate block processing has been implemented during operation is recorded as the G List. The function which specifies defect position information as the D List when the FORMAT UNIT command is executed, is prepared mainly to specify initial defect position information of the disk media which does not have the P List recorded on it. In the HDD, by specifying use of the P List and G List, advance notice of the defect positions can be specified during initialization, so ordinarily, it is not necessary to use the D List. When the D List is used for the HDD, caution should be exercised in the follow points.

1.The maximum number of defective sectors (total amount of 'sector slip' and 'alternate sectors') are calculated per :

a)Current condition of reallocated sectors:

(how many Slip Sectors have been allocated ? and so Alternate Sectors ? Since Defect table entry for Slip and Alternate are different size.)

b)The maximum size of Defect Management Table (Fixed value)

c)Current allocation condition of 'sector slip'

(i.e. Up to 16 consecutive Slip Sector can be controlled by 1 Slip Defect entry. So the necessary table size are varied not only the number of Defects but also the number of consecutive Slips.)

Consequently, the concrete Defect numbers cannot be described though the HDD guarantees 12,000 Slip Sectors and 3,000 Alternate Sectors at minimum. If defect processing which exceeds this limit is specified in the FORMAT UNIT command, that command is terminated with a CHECK CONDITION status (HARDWARE ERROR [=4] / No defect spare location available [=32-00]).

2.A defect descriptor specified as the D List are received normally if the specified defect position information is within a range which does not exceed the disk drive's physical boundaries (User Space), and is recorded as the G List, but formatting processing is executed only for the User Space in the range specified in the "Block descriptor" and "Format parameters" (Page 3), and the "Drive parameters" (Page 4) of the MODE SELECT parameter.

3.If a defect descriptor in the "Byte distance from the Index format" is specified in the D List, depending on the byte position of the specified defective byte, 2 sectors may be processed as defective sectors with one defect descriptor, or 1 sector may be processed as a defective sector with 2 or more defect descriptors. Also, if the specified defective byte position has no influence on data block read/write operations, that defect position information is disregarded and is not the object of defective sector processing, and thus is not recorded in the G List. Therefore, the defect position information specified in this command may not necessarily coincide with the defect position information read with the READ DEFECT DATA command after this command is terminated.

232 C141-C013