1670/1680 MAC SERIES Specifications The Micropolis Macintosh-Compatible disk drives are designed especially for Value-Added Distributors and Resellers of Macintosh storage systems and sub systems. Compatible with Mac Plus, Mac SE, Mac II, and Mac IIx computers. Half-height form factor adapts easily to Mac II and Mac IIx systems. Half-Height form factor adapts for low profile external package integration. The drives employ a closed-looped digital servo which ensures accurate tracking under all environmental conditions. Macintosh-compatible SCSI interface permit easy integration, eliminating the need for cable modification. SCSI features include: A full 64 Kbytes buffer with read-ahead capability for faster data access Less than 600 microseconds command overhead to improve overall throughput numbers Cylinder oriented defect management, offering the most reliable data integrity system available Formatted Capacity: Model Number Model 1673-5 1674-7 Total Mbytes 112 158 Bytes Per Sector -------------------- 512 -------------------- Sector Per Track --------------------- 36 -------------------- Cylinders ------------------- 1245 -------------------- Data Heads 5 7 Formatted Capacity: Model Number Model 1683-4 1684-7 Total Mbytes 193 340 Bytes Per Sector --------------------- 512 ------------------- Sector Per Track --------------------- 54 ------------------- Cylinders -------------------- 1777 ------------------- Data Heads 4 7 1670 Performance Seek Time (includes settling) Track to Track 4 msec Average 16 msec Maximum 37 msec Latency Time(average) 8.33 msec Rotational Speed 3600 rpm+/-5% Media Transfer Rate 10 MHz 1680 Performance Seek Time (includes settling) Track to Track 4 msec Average 14 msec Maximum 30 msec Latency Time(average) 8.33 msec Rotational Speed 3600 rpm+/-5% Media Transfer Rate 15 MHz Interface Mac SCSI Features Command Overhead Less than 600 Microseconds Buffer 64 KByte with parity Defect Management Cylinder oriented Data Integrity Automatic Retry with early/late strobe, track offset 48 bit ECC polynomial Parity through buffer Form Factor (Industry standard for 5 1/4 half-height) Height 1.625 inches (41.3 mm) Width 5.75 inches (146.1 mm) Depth 8.00 inches (203.2 mm) Weight 5 pounds (2.27 kg) maximum Other Specifications Power Requirements + 12V +/- 5% 1.0 Avg 2.0A Maximum during start-up + 5V +/- 5%, 1.9A Avg Power Dissipation, typical 15 Watts Acoustic Noise Idling 40 dBA Seeking 45 dBA Mounting Half-height 5 1/4 inch disk drive, any orientation Reliability MTBF 150,000 power-on hrs MTTR 15 minutes Preventive Maintenance none Electronic Adjustments none