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Cheetah 4LP Product Manual, Rev. B
3.1
Standard features
The Cheetah 4LP family has the following standard features:
• Integrated SCSI controller
• Single-ended or differential SCSI drivers and receivers
• 8-bit and 16-bit I/O data bus models available
• Asynchronous and synchronous data transfer protocol
• Firmware downloadable via SCSI interface
• Selectable sector size from 180 to 4,096 bytes/sector
• Programmable drive capacity
• Programmable sector reallocation scheme
• Flawed sector reallocation at format time
• Programmable auto write and read reallocation
• Reallocation of defects on command (Post format)
• Reed-Solomon error correcting code can correct up to 64-bit error
• Sealed head/disc assembly
• No preventative maintenance or adjustment required
• Dedicated laser textured head landing zone
• Embedded servo data rather than a separate servo data surface
• Self diagnostics performed at power on
• 1:1 interleave
• Zoned Bit Recording (ZBR)
• Vertical, horizontal, or top-down mounting
• Dynamic spindle brake
• Active IC terminators enabled by jumpers ("N" and "W" models only)
• 442 Kbyte data buffer (2 Mbyte optional)
• Hot Plug compatibility (Section 9.6.4.3 lists proper host connector needed) for "WC" and "DC" model drives
• SCAM (SCSI Configured AutoMagically) plug-n-play level 1 compliant as shipped. Level 2 is a factory
installed option.
3.2
Media characteristics
The media used on the drive has a diameter of approximately 3.5 inches (86 mm). The aluminum substrate is
coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability
and environmental protection.
3.3
Performance
• Supports industry standard Fast-20 SCSI interface (also called "Ultra SCSI")
• Programmable multi-segmentable cache buffer
• 10,033 RPM spindle. Average latency = 2.99 ms
• Command queuing of up to 64 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
3.4
Reliability
• 1,000,000 hour MTBF
• LSI circuitry
• Balanced low mass rotary voice coil actuator
• Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)
• Incorporates Seek To Improve Reliability algorithm (STIR)
• 5-year warranty
• Dithering
7
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