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Barracuda 50 Product Manual, Rev. C
3.1
Standard features
The Barracuda 50 family has the following standard features:
• Integrated SCSI controller
• Multimode SCSI single-ended or low voltage differential drivers and receivers
• 16 bit I/O data bus
• Asynchronous and synchronous data transfer protocol
• Firmware downloadable via SCSI interface
• Selectable sector sizes from 512 to 2,048 bytes/sector in multiples of 4 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)
• Enhanced ECC correction capability up to 185 bits
• Sealed head and 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 when power is applied to the drive
• 1:1 Interleave
• Zoned bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 1 Mbyte, or optional 4 Mbyte data buffer
• Hot plug compatibility (section 9.6.4.2 lists proper host connector needed) for "LC" model drives
• SCAM (SCSI Configured AutoMagically) plug-n-play level 2 compliant, factory set to level 1 (not user select-
able)
• Low audible noise for office environment
• Low power consumption
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 and Fast-40 SCSI interfaces (also called "Ultra-1 SCSI" and "Ultra-2
SCSI," respectively)
• Programmable multi-segmentable cache buffer (see Section 4.4)
• 7200 RPM spindle. Average latency = 4.17 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
7
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