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DISK DRIVE OPERATION
SpinPoint V40 Product Manual
37
5.5.3 Defect Management
The SpinPoint V40 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 233-bit burst error
• Ten 3-bytes burst error
• Up to 60 bytes with reassure pointer (off-line correction)
These errors are corrected on the fly with no performance degradation.
5.5.6 SMART
The intent of Self-monitoring, Analysis and Reporting Technology (SMART) is to protect user data and to
minimize the likelihood of unscheduled system downtime that may be caused by unpredictable degradation
and/or device fault. By monitoring and storing critical performance and calibration parameters, SMART
devices attempt to predict the likelihood of near-term degradation or fault condition. Providing the host
system knowledge of a negative reliability condition allows the host system to warn the user of the
impending risk of a data loss and advise the user of appropriate action.
5.5.7 AAM
The Automatic Acoustic Management (AAM) feature allows the SpinPoint V40 to operate in one of several
acoustic noise levels. This provides the user with the option of selecting the desired level of sound noise
emanating from the HDD. Low noise operating levels are achieved with some small degree of performance
degradation. With this feature disabled, the HDD operates with maximum performance and maximum
acoustic noise level. This feature is enabled by the Set Features command.