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MAC.TXT
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1989-10-03
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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