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Spinpoint
M8 Product Manual REV
2.3
35
If the sector is not automatically relocated, the drive drops out of write caching and reports the error as an ID Not
Found. If the write command is still active on the AT interface, the error is reported during that command.
Otherwise, it is reported on the next command.
5.5.3 Defect Management
The Spinpoint M8 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.
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 s
toring 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 A
P
M
The Automatic Power Management (APM) feature set is an optional feature set that allows the host to select a
power management level. The power management level is specified using a scale from the lowest power
consumption setting to the maximum performance level. Device performance may increase with increasing power
management levels. Device power consumption may increase with increasing power management levels. This
feature is enabled by the Set Features command.