Mounting Requirements - Seagate ST251N Product Manual

1.10 MOUNTING REQUIREMENTS
The ST251 N/277N may be mounted horizontally with the spindle motor
down, or on either side. The drive should not be tilted (front to back)
in any position, by more than 5°.
For optimum performance the drive should be formatted in the same
orientation as it will be mounted in the host system.
ST251 N/277N Product Manual, Rev. B 1-7