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                         SEAGATE TECHNOLOGY, INC.
                              1-800-SEAGATE
                          http://www.seagate.com
                            (C)opyright 1991



ST-252 ST412 MFM
(same as ST-251 with Terminator that cannot be removed, therfore
drive must be installed at the end of the daisychain cable.)

                                                          /Ä4Ä3Ä2Ä1Ä\
                                                          ³ O O O O ³ Power
              o o o o o o o o                             ÀÄÄÄÄÄÄÄÄÄÙ
  ÚData Cable o o o o o o o o  ÚController Cable    1       5 G G 12
 ÍÍÍÍÍÍÍÍÍ ÍÍ ³ ³ ³ ³ ³ ³ ³ ³ ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ ÍÍÍ   ÍÍÍÍÍÍÍÍÍÍÍÍ
              ³ ³ ³ ³ ³ ³ ³ ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄ1
              ³ ³ ³ ³ ³ ³ ³ ³ ÀÄTerminatorÄÙ- cannot be removed
              ³ ³ ³ ³ ³ ³ ³ ³
Drive Select->1 2 3 4 ³ ³ ³ À Radial
                ³ ³ ³ ³ ³ ÀÄÄ Reserved
                ³ ÀÂÙ ³ ÀÄÄÄÄ Write Fault
                ³  ³  ÀÄÄÄÄÄÄ Factory Test
                ³  ÀÄÄÄÄÄÄÄÄÄ Never Used (Drive Select 3 and 4)
                À If twisted cable, use Drive Select 2

                          ST - 252

       UNFORMATTED CAPACITY (MB) ________________51.2
       FORMATTED CAPACITY (17 SECTORS) (MB) _____42.8
       ACTUATOR TYPE ____________________________STEPPER
       TRACKS ___________________________________4,920
       CYLINDERS ________________________________820
       HEADS ____________________________________6
       DISCS ____________________________________3
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________MFM
       TRANSFER RATE (mbits/sec) ________________5.0
       SPINDLE SPEED (RPM) ______________________3,600
       INTERFACE ________________________________ST412
       TPI (TRACKS PER INCH) ____________________777
       BPI (BITS PER INCH) ______________________9,935
       AVERAGE ACCESS (ms) ______________________40/28*
       SINGLE TRACK SEEK (ms) ___________________8
       MTBF (power-on hours) ____________________100,000
       POWER REQUIREMENTS: +12V START-UP (amps) _2.0/2.5*
                           +12V TYPICAL (amps) __0.5
                           +5V TYPICAL (amps) ___1.0/1.2*
                           TYPICAL (watts) ______11/12*
                           MAXIMUM (watts) ______29/36*
       BUFFERED STEP PULSE RATE (micro sec) _____3-200
       WRITE PRECOMP (cyl) ______________________N/A (821)
       REDUCED WRITE CURRENT (cyl) ______________N/A (821)
       LANDING ZONE (cyl)________________________AUTO PARK
       IBM AT DRIVE TYPE ________________________44, 40, or 3**

       *ST251-0/ST251-1
       **MAY REQUIRE PARTITIONING SOFTWARE

Seagate reserves the right to change, without notice, product 
offerings or specifications. (6/26/90)

A copy of this specification file may be obtained by FTP at
ftp://ftp.seagate.com/techsuppt/mfm/st252.txt.