Seagate ST15150N Product Manual - Page 41
Hot plugging Barracuda 4 disc drives - jumpers
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ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D 31 6.2.8 Hot plugging Barracuda 4 disc drives Caution. Hot-plug drives are not designed for simultaneous power disconnection and physical removal. During power-up and power-down periods, the hot SCSI connect/disconnect capability does not produce glitches or any corruptions on an active SCSI bus. Notes. It is the responsibility of the systems integrator to assure that no temperature, energy, or voltage hazard is presented during the hot connect/disconnect operation. The SCSI bus termination must be external to the drive being inserted or removed. Connector J01 must be configured so there is no connection between the drive and the TRMPWR signal on the SCSI bus. Removing all term power jumpers accomplishes this. When installing the drive on a carrier or tray, discharge the static electricity from the carrier or tray prior to inserting it into the system. Procedure: 1. Ensure that all I/O processes to the drive you are insertinng or removing have ceased (for ST15150WC and ST15150DC drives, all I/O processes on the entire SCSI bus must be inactive). All other devices on the same SCSI bus must have receivers that conform to the SCSI-3 standard. 2. When inserting a drive, attach the power connector to the drive first, at least 1 millisecond before attaching the I/O connector to the bus. Maintain the ground connections during and after connecting the drive to the SCSI bus. When removing a drive, disconnect the I/O connector at least 1 millisecond before removing the power connector from the drive, and wait for the spindle to stop. The disc drive motor should come to a complete stop prior to changing the plane of operation to ensure data integrity. Notes. Do not remove or add terminator power or resistance to the SCSI bus while hot plugging a disc drive. The power to the electronics and mechanics of the drive may be simultaneously switched with the bus contacts if the power distribution system is able to maintain adequate power stability to other devices during the transition and the grounding requirements are met by following the instructions provided in step 2.