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Text File  |  1989-09-18  |  4.3 KB  |  99 lines
  1.  
  2.                       1670/1680 MAC SERIES
  3.                          Specifications
  4.  
  5. The Micropolis Macintosh-Compatible disk drives are designed
  6. especially for Value-Added Distributors and Resellers of Macintosh
  7. storage systems and sub systems.
  8.  
  9. Compatible with Mac Plus, Mac SE, Mac II, and Mac IIx computers.
  10.   Half-height form factor adapts easily to Mac II and Mac IIx    
  11.   systems.
  12.   Half-Height form factor adapts for low profile external        
  13.   package integration.
  14.   The drives employ a closed-looped digital servo which ensures  
  15.   accurate tracking under all environmental conditions.
  16.   Macintosh-compatible SCSI interface permit easy integration,   
  17.   eliminating the need for cable modification.
  18.   SCSI features include:
  19.     A full 64 Kbytes buffer with read-ahead capability for faster 
  20.     data access
  21.     Less than 600 microseconds command overhead to improve       
  22.     overall throughput numbers
  23.     Cylinder oriented defect management, offering the most       
  24.     reliable data integrity system available
  25.  
  26. 1670 Mac Series
  27.                                 Formatted Capacity
  28.  
  29.   Model                 1673-5                   1674-7 
  30.   Total Mbytes             112                      158
  31.   Bytes Per Sector  ------------------- 512 ---------------------
  32.   Sector Per Track  -------------------- 36 ---------------------
  33.   Cylinders         ------------------ 1245 ---------------------
  34.   Data Heads                 5                        7
  35.  
  36. 1680 Mac Series
  37.                                 Formatted Capacity
  38.  
  39.   Model                 1683-4                   1684-7 
  40.   Total Mbytes             193                      340
  41.   Bytes Per Sector  ------------------- 512 ---------------------
  42.   Sector Per Track  -------------------- 54 ---------------------
  43.   Cylinders         ------------------ 1776 ---------------------
  44.   Data Heads                 4                        7
  45.  
  46. 1670 Performance
  47.   Seek Time (includes settling)            Track to Track  4 msec
  48.                                            Average        16 msec
  49.                                            Maximum        37 msec
  50.   Latency Time(average)                                 8.33 msec
  51.   Rotational Speed                                      3600 msec
  52.   Media Transfer Rate                                      10 MHz
  53.  
  54. 1680 Performance
  55.  
  56.   Seek Time (includes settling)            Track to Track  4 msec
  57.                                            Average        14 msec
  58.                                            Maximum        30 msec
  59.   Latency Time(average)                                 8.33 msec
  60.   Rotational Speed                                      3600 msec
  61.   Media Transfer Rate                                      15 MHz
  62.  
  63. Interface
  64.  
  65.   Compatibility                                          Mac SCSI
  66.   Command Overhead                     Less than 600 Microseconds
  67.   Buffer                                     64 KByte with parity
  68. Defect Management                               Cylinder oriented
  69.  
  70. Physical
  71.  
  72. Form Factor             (Industry standard for 5 1/4 half-height)
  73.   Height                                   1.625 inches (41.3 mm)
  74.   Width                                   5.75  inches (146.1 mm)
  75.   Depth                                   8.00  inches (203.2 mm)
  76.   Weight                               5 pounds (2.27 kg) maximum
  77.  
  78. Other Specifications
  79.  
  80. Power Requirements-typical
  81.   + 12V +/- 5%                                   1.0 Avg. Seeking
  82.                                      2.0A Maximum during start-up
  83.   + 5V +/- 5%,                                  1.9A Avg. Seeking
  84. Power Dissipation, typical                               15 Watts
  85. Acoustic Noise
  86.   Idling                                                   40 dBA
  87.   Seeking                                                  45 dBA
  88. Mounting       Half-height 5 1/4 inch disk drive, any orientation
  89.  
  90. Reliability
  91.   MTBF                                       150,000 power-on hrs
  92.   MTTR                                                 15 minutes
  93. Preventive Maintenance                                       none
  94. Electronic Adjustments                                       none
  95. Data Integrity 
  96.   Automatic Retry with early/late strobe, track offset
  97.   48 bit ECC polynomial
  98.   Parity through buffer
  99.