Product manual

Product Manual - Hawk 2 Family (Wide bus) SCSI-2 (Volume 1), Rev. A 3
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3.0 General description
The drives are a member of a family of low cost, high performance, highly reliable, random access storage
devices designed to meet the needs of the OEM marketplace.
The drive records and recovers data on 3.7 inch (95 mm) fixed discs.
The drive supports the Small Computer System Interface (SCSI-1, SCSI-2 and SCSI-3) as described in the
ANSI SCSI Interface Specifications to the extent described in this product specification (Volume 1). This
manual defines the product performance characteristics of the ST12400 wide family of drives, together with
the SCSI-2/SCSI-3 Interface Product Manual P/N 77738479 (Vol. 2, Version 2) which describes the general
interface characteristics of this and other families of Seagate 3.5-inch drives.
The drive interface supports multiple initiators, disconnect/reconnect, self configuring host software and au-
tomatic features that relieve the host from the necessity of knowing the physical characteristics of the targets
(logical block addressing is used).
The Head/Disc Assembly (HDA) is environmentally sealed at the factory. Air recirculates within the HDA
through a nonreplaceable filter to maintain a contamination free head/disc environment.
Refer to Figure 3.0-1 for an exploded view of the drive. NEVER disassemble the Head/Disc Assembly (HDA).
This exploded view is for information only. Do not attempt to service items in the sealed environmental
enclosure (heads, media, actuator, etc.) as this requires special facilities. The drive contains no parts re-
placeable by the user. The drive warranty is voided if the HDA is opened.
The ST12400 wide family drives use a dedicated landing zone at the innermost radius of the media to
eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically
goes to the landing zone when the power is removed.
The ST12400 wide family drives incorporate an automatic shipping lock which prevents potential damage to
the heads and discs that result from movement during shipping and handling. The shipping lock disengages
when power is applied to the drive and the head load process begins.
The ST12400 wide family drives decode Track 0 location from the dedicated servo surface to eliminate
mechanical transducer adjustments and related reliability concerns.
The ST12400 wide family drives use a high performance actuator assembly that consists of a low inertia,
balanced, patented, straight arm design that provides excellent performance with minimum power dissipa-
tion.