Handling Precautions; Shipping Zone; Auto-Truncation - Seagate ST251R Product Manual

1.11.2 HANDLING PRECAUTIONS
After unpacking, and prior to system integration, the drive is exposed
to potential handling and ESD hazard.
Do not touch the PCB edge-connectors, board components or the
printed curcuit cable without observing static-discharge precautions.
Handle the drive by the frame only.
Always rest the drive on a padded surface until it is mounted in the
host system.
1.11.3 SHIPPING ZONE
Upon power-down, the read/write heads will automatically move to
the shipping zone. All portions of the head/slider assembly will park
inboard of the maximum data cylinder. When power is applied, the
heads will recalibrate to Track 0.
The heads may also be parked in the shipping zone by issuing a seek
command to the maximum data cylinder plus one
(820).
1.12 AUTO-TRUNCATION
The drive will enter the auto-truncation mode if the controller issues
an excessive number of step pulses, which would place the read/write
heads outward beyond Track 0 or inward beyond the maximum data
cylinder plus one (beyond
820).
With auto-truncation active, the drive will ignore additional pulses,
take control of the actuator, and recalibrate the heads to Track 0.
Caution: If the controller is still issuing step pulses after the drive
issues Seek Complete from auto-truncation mode, the drive will either
reenter auto-truncation mode if Direction-In is false, or step the re-
maining cylinders if Direction-In is true.
ST251/251 R/277R Product Manual, Rev.A
1-13