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C141-E035-03EN1 - 4
(10) Error recovery
The IDD can try to recover from errors in SCSI bus or the disk drive using its powerful retry
processing. If a recoverable data check occurs, error-free data can be transferred to the
initiator after being corrected in the data buffer. The initiator software is released from the
complicated error recover processing by these error recovery functions of the IDD.
(11) Automatic alternate block reassignment
If a defective data block is detected during read, the IDD can automatically reassign its
alternate data block.
(12) Programmable data block length
Data can be accessed in fixed-block length units. The data block length is programmable, and
can at initializing with a multiple of two for the 512 to 528 bytes.
(13) Defective block slipping
A logical data block can be reallocated in a physical sequence by slipping the defective data
block at formatting. This results in high speed contiguous data block processing without a
revolution delay due to defective data block.
(14) High speed positioning
A rotary voice coil motor achieves fast positioning.
(15) Large capacity
A large capacity can be obtained from 3.5-inch disk drives by dividing all cylinders into
several partitions and changing the recording density on each partition (constant density
recording). The disk subsystem with large capacity can be constructed in the good space
efficiency.
(16) Start/Stop of spindle motor
Using the SCSI command, the host system can start and stop the spindle motor.
(17) Diagnosis
The IDD has a diagnostic capability which checks internal controller functions and drive
operations to facilitate testing and repair.