SEAGATE TECHNOLOGY, INC.
Customer Technical Support FAX Network +1 408 438-8137
Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
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� United States +1 408 438-8771 � United Kingdom +44 628 478011 �
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� Germany +49 89 140-9331 � Singapore +65 227-2217 �
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(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.)
/�4�3�2�1�\
� O O O O � Power
o o o o o o o o �����������
�Data Cable o o o o o o o o �Controller Cable 1 5 G G 12
��������� �� � � � � � � � � �������������������� ��� ������������
� � � � � � � � �������������1
� � � � � � � � ��Terminator��- cannot be removed
� � � � � � � �
Drive Select->1 2 3 4 � � � � Radial
� � � � � ��� Reserved
� ��� � ����� Write Fault
� � ������� Factory Test
� ���������� Never Used (Drive Select 3 and 4)
� 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**
