Seagate ST31276A

Technical Specifications

• Form Factor: 3.5-inch internal hard disk drive
• Net Storage Capacity: 1276 MB (1.27 GB formatted)
• Physical Configuration: 2 disks, 4 data surfaces, 4 read/write heads
• Rotational Speed: 4500 RPM
• Host Interface: ATA/IDE (PIO mode 4, multiword DMA mode 2)
• Buffer Size: 64 KB with adaptive cache management
• Data Block Size: 512 bytes
• Average Seek Time: 12.5 ms
• Track-to-Track Seek Time: 3.0 ms
• Maximum Seek Time: 24 ms
• Average Rotational Latency: 6.67 ms
• Error Correction: Reed-Solomon ECC, corrects two 17-bit errors or one 41-bit error without latency penalty
• Power Input: +5 V DC and +12 V DC
• Operating Temperature: 0°C to +60°C
• Shock Resistance: High mechanical shock tolerance for industrial environments

Functional Features

• Automatic actuator latch against inner stop upon power-down to protect heads and media
• Microprocessor-controlled power-on self-test and diagnostic routines
• Read Look Ahead and Write Caching algorithms for enhanced throughput
• Auto-Translate (Universal Translate) feature for broad host system compatibility
• Supports daisy-chaining up to two drives on a single ATA interface
• Automatic error retry and on-the-fly error correction

Application Scenarios

• Industrial embedded computers and automation control systems
• Legacy CNC machine tool control data storage
• PLC system data logging and program storage
• Vintage industrial computing platforms
• Low-demand industrial data processing and archiving

Material & Structural Features

• Cast metal base plate for structural rigidity and heat dissipation
• Sealed head disk assembly (HDA) to prevent internal contamination
• Rotary voice coil actuator with embedded servo system
• Standard 40-pin IDE connector and 4-pin Molex power connector

Installation Requirements

• Mounts in standard 3.5-inch internal drive bays
• Connect to 40-pin ATA interface ribbon cable and 4-pin power connector
• Set master/slave jumpers correctly when installing multiple drives
• Ensure adequate ventilation around the drive to maintain operating temperature

Usage Notes

• Avoid physical shock and vibration during operation
• Do not disassemble the sealed HDA; this will void warranty and cause permanent drive failure
• Back up critical data on a regular schedule
• Handle the drive by its edges only to prevent ESD damage to electronic components