Barracuda 2HP
|
Capacity:
Speed:
Average Read Time:
|
1.85 GB
7200 rpm
8 ms |
|
ST-12450W SCSI-2 Fast Wide (Barracuda 2, 2HP)
2HP = 2 Head Parallel = two read write channels at once
J01����Ŀ
(see 1��
�����������ͻ below) ���
� REAR VIEW � 1Ŀ ��������J4-1���Ŀ
�����������ͼ �"� |
�"�J4 1-6 �
�"�(see below) |
�"��J4-6�Ŀ �
(TOP) J5 �"�-J4-8� | |
___________________ ��� �1�/���������\ | | |
�( �����������������1)ͳ::::::�� 0 0 0 0 �� � � �
\�����������ij����/ � �� ���5�G�G�12� � � 1
68 pin I/O Cable� ������ : : : : : : :
Connection ������ � � � � � � 2
������ Reserved ������� � � � � � �
Spindle Synch Cable Connector ��ٳ���� (J4-7 and J4-8 � � � � � �
(pin-11 SSREF, pin-12 ground) ����� are reserved) � � � � � �
Remote LED Connector ������������ٳ��� � � � � � �
[pin-9 cathode (neg), ���� Enable Drive ����� � � � � �
pin-10 anode (pos)] ���� Terminators � � � � �
���� Reserved ����������� � � � �
SCSI ID = 8 ����������������������ٳ�� (default OFF) � � � �
SCSI ID = 4 �����������������������ٳ� Parity Disable ������� � � �
SCSI ID = 2 ������������������������ٳ Enable Motor Start ����� � �
SCSI ID = 1 �������������������������� Delay Motor Start �������� �
SCSI ID = 0 (none) (10 sec * ID) �
Write Protect Enable �������
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� J01 - Terminator Power Jumpers ������������������Ŀ
���������������������������������� �
Terminator power from the drive. �1�ķ *
(default) ����
� �
Terminator power from the �ķ *
SCSI bus. ��
���
Terminator power to the SCSI bus �ķ
���
���
Terminator power to the SCSI bus and ���ķ*
drive. ���
����
* Valid for single-ended drives only.
Note: ST-12450WD (differential model) does not come with any
provision to use Termination resistors. Therefore, SCSI bus
needs to be externally terminated.
ST-12450W
UNFORMATTED CAPACITY (MB) ________________2437
FORMATTED CAPACITY (512 byte sectors)_____1849
FORMATTED CAPACITY (2048 byte sectors)____2134
Standard OEM model formatted to 512
bytes/block
AVERAGE SECTORS PER TRACK ________________149 rounded down
ACTUATOR TYPE ____________________________ROTARY VOICE COIL
TRACKS ___________________________________48,726
CYLINDERS ________________________________2,710 user
HEADS ______PHYSICAL/LOGICAL______________18/9
DISCS (3.5 in) ___________________________10
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec):
Per Logical Head _______________________68.6 to 113.0
Per Physical Head ______________________34.3 to 56.5
EXTERNAL TRANSFER RATE (mbyte/sec) _______20 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 WIDE
ASA
BYTES PER TRACK __________________________99,536 average
SECTORS PER DRIVE ________________________3,957,500
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
SHOCK (G's):
operating (Read/Write) __________2
nonoperating ____________________50
ACOUSTICS (typ/max dBA) __________________4.7/
POWER DISSIPATION (watts/BTUs) Active ____16/54
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) _________13.5
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. (02/05/98)
