Seagate Cheetah 18FC ST118202FC, Product Manual

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6 Cheetah 18FC Product Manual, Rev. C
3.1 Standard features
Cheetah 18FC
drives have the following standard features:
• Integrated dual port FC-AL controller
• Concurrent dual port transfers
• Support for FC arbitrated loop, private and public loop attachment
• Differential copper FC drivers and receivers
• Downloadable firmware using the FC-AL interface
• Drive selection ID and configuration options are set on the FC-AL backpanel or through interface com-
mands. Jumpers are not used on the drive.
• Fibre Channel worldwide name uniquely identifies the drive and each port
• User-selectable logical block size (512 to 4,096 bytes per logical block)
• Selectable frame sizes from 128 to 2,112 bytes
• Industry standard 3.5-inch half-high form factor dimensions
• Programmable logical block reallocation scheme
• Flawed logical block reallocation at format time
• Programmable auto write and read reallocation
• Reed-Solomon error correction code
• Sealed head and disc assembly (HDA)
• No preventive maintenance or adjustments required
• Dedicated head landing zone
• Automatic shipping lock
• Embedded Grey Code track address to eliminate seek errors
• Self-diagnostics performed at power on
• 1:1 interleave
• Zone bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 1,024 Kbyte data buffer (see Section 4.5)
• Embedded servo design
• Supports SCSI enclosure services via interface connector
• 128-deep task set (queue)
• Supports up to 32 initiators
• Reallocation of defects on command (Post Format)
• Fibre Channel interface transports SCSI protocol
• Supports SCSI Enclosure Services through the interface connector
3.2 Media description
The media used on the drive has a diameter of approximately 95 mm (approximately 3.7 inches). The alumi-
num substrate is coated with a thin film magnetic material, overcoated with a proprietary protective layer for
improved durability and environmental protection.
3.3 Performance
• Programmable multi-segmentable cache buffer
• 106 Mbytes/sec maximum instantaneous data transfers per port.
• 10,025 RPM spindle; average latency = 2.99 msec
• Command queuing of up to 128 commands
• Background processing of queue
• Supports start and stop commands