Samsung 3.5" hard disk drives manual Defect Management, Automatic Defect Allocation, Smart, 7 AAM

DISK DRIVE OPERATION

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.

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