Barracuda 2
|
Capacity:
Speed:
Average Read Time:
|
2.14 GB
7200 rpm
8 ms |
|
ST-12550N SCSI-2 Fast (Barracuda 2)
�����������ͻ J01����Ŀ 1Ŀ �������J4-1�������������Ŀ
� REAR VIEW � (see 1�� �"� �
�����������ͼ below) ��� �"� �
�"�J4 1-11 �
Terminating ResistorsĿ �"�(see detail below) �
������Ŀ ����ijĿ �"� �
(TOP) �������1 �������1 �"��J4-11� �
���������������������������/���������\ � �
͵::::::::::::::::::::::::1Ƴ 0 0 0 0 �� � �
����������������������ͳ�����5�G�G�12� � 5 1
50 pin I/O Cable Connection�� : : : : : : : : : : :
� � � � � � � � 6 � 2
SCSI ID = 0 (none) � � � � � � � � � � �
SCSI ID = 4 �������� � � � � � � � � � �
SCSI ID = 2 ���������� � � � � � � � � �
SCSI ID = 1 ������������ � � � � � � � �
Reserved (default OFF) ��������� � � � � � � �
Parity Disable ������������������� � � � � � �
Enable Motor Start ����������������� � � � � �
Delay Motor Start (10 sec * ID) ������ � � � �
Write Protect Enable ������������������� � � �
Remote LED Connector ��������������������� � �
[pin-5 cathode (neg), pin-6 anode (pos)] � �
Reserved (default OFF) ��������������������� �
Spindle Synch Cable Connector ����������������
(pin-1 SSREF, pin-2 ground)
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� J01 - Terminator Power Jumpers ������������������Ŀ
���������������������������������� �
Terminator power from the drive. �1�2� *
(default) ����
� �
Terminator power from pin 26 on the �ķ *
SCSI bus. ��
���
Terminator power to the SCSI bus on �ķ
pin 26. ���
���
Terminator power to the SCSI bus and ���ķ*
drive. ���
����
* Valid for single-ended drives only.
Note: ST-12550ND (differential model) does not come with any
provision to use Termination resistors. Therefore, SCSI bus
needs to be externally terminated.
ST-12550N
UNFORMATTED CAPACITY (MB) ________________2572
FORMATTED CAPACITY (xx SECTORS) (MB) _____2139
AVERAGE SECTORS PER TRACK ________________81 rounded down
ACTUATOR TYPE ____________________________ROTARY VOICE COIL
TRACKS ___________________________________51,433
CYLINDERS ________________________________2,707 user
HEADS ______PHYSICAL______________________19
DISCS (3.5 in) ___________________________10
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec)________34.3 to 56.5
EXTERNAL TRANSFER RATE (mbyte/sec) _______4 Async
EXTERNAL TRANSFER RATE (mbyte/sec) _______10 Sync
SPINDLE SPEED (RPM) ______________________7,200
AVERAGE LATENCY (mSEC) ___________________4.17
BUFFER ___________________________________1024 KByte
Read Look-Ahead, Adaptive,
Multi-Segmented Cache
INTERFACE ________________________________SCSI-2 FAST
ASA
BYTES PER TRACK __________________________49,768 average
SECTORS PER DRIVE ________________________4,177,781
TPI (TRACKS PER INCH) ____________________3,047
BPI (BITS PER INCH) ______________________52,187
AVERAGE ACCESS (ms) (read/write)__________8.0/9.0
Drive level without controller overhead
SINGLE TRACK SEEK (ms) ___________________0.6/0.9
MAX FULL SEEK (ms) _______________________17/19
MTBF (power-on hours) ____________________500,000
POWER DISSIPATION (watts/BTUs) Active ____16/55
Idle ______15/51
POWER REQUIREMENTS: +12V START-UP (amps) _2.18
+12V TYPICAL (amps) __0.83 idle
+5V START-UP (amps) __1.0
+5V TYPICAL (amps) ___0.76 idle
IDLE (watts) _________13
LANDING ZONE (cyl) _______________________AUTO PARK
IBM AT DRIVE TYPE ________________________0 or NONE
Physical:
Height (inches/mm): 1.63/41.4
Width (inches/mm): 4.00/101.6
Depth (inches/mm): 5.97/151.6
Weight (lbs/kg): 2.3/1.04
Already low-level formatted at the factory with 9 spare sectors
per cylinder and 1 spare cylinder per unit.
ZBR = Zone Bit Recording = Variable sectors per track
Seagate reserves the right to change, without notice, product
offerings or specifications. (09/18/96)
