(IBM) HDD SCSI DCHS 4GB

Standard features

Barracuda 4 drives have the following standard features: • Integrated SCSI controller • Single-ended or differential SCSI drivers and receivers • Asynchronous and synchronous data transfer protocols • Firmware downloadable using a SCSI interface • Selectable sector size from 180 to 4,096 bytes per sector • Programmable sector reallocation scheme • Flawed sector reallocation at format time • Programmable auto write and auto read reallocation • Reallocation of defects on command (post format) • 96-bit Reed-Solomon error correction code • Sealed head and disc assembly (HDA) • No preventive maintenance or adjustments required • Dedicated head landing zone • Automatic shipping lock • Automatic thermal compensation • 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 • Active termination for single-ended models • 1,024 Kbyte data buffer (see Section 5.5)

Performance • Programmable multi-segmentable cache buffer • 7,200 RPM spindle; average latency = 4.17 msec • Command queuing of up to 64 commands • Background processing of queue • Supports start and stop commands • Provides synchronized spindle capability • Low audible noise for office environment • Low power consumption 4.1.1 Reliability • 800,000 hour MTBF • Adaptive seek velocity; improved seek performance • LSI circuitry • Balanced low-mass rotary voice-coil actuator