60 MB Tape Drive  (250-4079A)  Specifications         Faxback Doc. # 5849


CAPACITY (AFTER ECC)
   250-4079A w/205 ft DC2000 cartridge......................40.4MB; ~ 80MB
                                                             w/compression
   250-4079A w/307 ft DC2120 cartridge.....................60.6MB; ~ 120MB
                                                             w/compression

TAPE FORMAT................................QIC-40 (20 tracks, 10,000 FRPI)

RELIABILITY
   Hard Error Rate...........................1 in 10^14 bits read with ECC
   MTBF......................................40,000 hours (6% tape motion)

PERFORMANCE
   10MB file-by-file backup
      at 500 kb/s transfer rate.........................<6 minutes typical
      at 250 kb/s transfer rate........................<10 minutes typical
   End-to-end seek time
      205' tape.................................................28 seconds
      307' tape.................................................40 seconds
   Format time
   25-4079A tape drive:
      at 500 kb/s transfer rate
         205' tape..............................................36 minutes
         307' tape.........................................51 min (approx)
      at 250 kb/s transfer rate
         205' tape..............................................72 minutes
         307' tape........................................101 min (approx)

POWER REQUIREMENTS
   12VDC (+5%)........................................0.8A avg. 2.75A peak
                                                           <150ms duration
   5VDC (+5%).........................................................0.3A
   Total power...............................................1.5W standby,
                                                             11.5W typical

TAPE MOTION
   Speeds and Times
      Read/Write/Format rate @ 250 kb/s.............................25 ips
      Read/Write/Format rate @ 500 kb/s.............................50 ips
      Forward/Reverse/Seek..........................................90 ips

ENVIRONMENTAL
   Temperature
      Operating.............................................+41° to +113°F
                                                       (cartridge limited)
Shipping and storage........................................-40° to +148°F
                                                           (-40° to +65°C)
   Humidity
      Operating...............................20% to 80% RH non-condensing
                                                   80°F (27°C) Maximum dew
                                                          point (wet bulb)

PHYSICAL
Overall size (internal drive)...........4.0" wide, 1.625" high, 5.32" deep
                                                    (101.6 x 41.2 x 135mm)

TAPE (FLOPPY) CONTROLLER
   Type........................................Tandy 3000NL, 4000, 4000LX,
                                                    4020LX, 4025LX, 5000MC
   Encoding method.....................................................MFM
   Data transfer rates...............................500 kb/s and 250 kb/s
   Transfer rate selection...............Automatically switches to fastest
                                     allowable rate. (Software controlled)

COMMUNICATIONS..................................QIC-117 Common Command Set

RAM REQUIRED........................................................512 KB


(smm 08/05/93)