3. Since the IDD has the automatic readjustment function of
positioning(seek) control, it automatically executes the adjustment
operations with seek at specific intervals from power on (first
adjustment: 2 minutes after power on). When the LED display
requirements are set to "READY status," the LED on the front panel
blinks during the adjustment. This does not indicate a drive error.
Initializing the drive
Since the disk drive is formatted with a specific (default) data format for
each model (part number) when shipped from the factory, the disk may not
need to be low-level formatted (initialized) when it is installed in the
However, to set data attributes different from the default format, the disk
must be reformatted according to the instructions below.
1. Connect the IDD to be reformatted to the system.
2. If it is necessary to change the sector size (data block length), issue a
MODE SELECT command that specifies the new data block length, as
shown in Figure 3.7 below.
1 0 0 0 1 0 0 0 0
Block length (MSB)
X000100' for 256 bytes/sector
X000200' for 512 bytes/sector
X000400' for 1024 bytes/sector
11 Block length (LSB)
Figure 3.8 MODE SELECT Command for Reformatting
3. Issue a FORMAT UNIT command. The disk medium is reformatted
with the specified block length, and the alternate block assignment for
the medium defects is performed based on the primary defect list.
FS810125-01 . . . A
Fujitsu America, Inc.