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Spinpoint M8U-Internal Product Manual REV 3.4
31
INSTALLATION
5.5.3 Defect Management
The Spinpoint M8U hard disk drive media is scanned for defects. After defect scanning, the defective sectors
are saved in the defect list. A defect encountered in the manufacturing process is slipped to the next
physical sector location. All logical sector numbers are pushed down to maintain a sequential order of
data. The read/write operation can “slip” over the defective sectors so that the only performance impact is
idle time.
5.5.4 Automatic Defect Allocation
The automatic defect allocation feature automatically maps out defective sectors encountered during read
sector or write sector operations. These types of defective sectors are typically caused by grown defects.
During write operations, if write errors are encountered, all sectors within the target servo frame are mapped
out. Original data is transferred and written into designated reserved sector areas determined by the HDD
firmware.
5.5.5 Multi-burst ECC Correction
The drive uses a Reed-Solomon code to perform error detection and correction. For each 512 byte block,
the software error correction polynomial is capable of correcting:
• One 191-bit burst error
• Up to 48 bytes with reassure pointer (off-line correction)
These errors are corrected on the fly with no performance degradation.