SEAGATE TECHNOLOGY, INC. Customer Technical Support FAX Network +1 408 438-8137 Customer Technical Support Bulletin Boards (300-9600, 8-N-1) 旼컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴커 � United States +1 408 438-8771 � United Kingdom +44 628 478011 � 쳐컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 � Germany +49 89 140-9331 � Singapore +65 227-2217 � 읕컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컨컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴켸 (C)opyright 1993 ST-12400N SCSI-2 Fast �袴袴袴袴袴敲 � REAR VIEW � (ST-12400N only) 훤袴袴袴袴袴� 50 pin I/O Cable Connection � J1郞袴袴袴袴袴袴袴袴袴袴袴�1� /컴컴컴컴�\ TOP (HDA) 孤:::::::::::::::::::::::::팠� 0 0 0 0 넌� 突袴袴袴袴袴袴袴袴袴袴袴袴� 읕5횳횳�12� BOTTOM �袴袴袴袴袴敲 � REAR VIEW � (ST-12400NC only) 훤袴袴袴袴袴� 80 pin I/O and DC Power Cable Connection � J1 /컴컴냐컴컴컴컴컴컴컴\ TOP (HDA) 袴袴袴袴袴/ 利利利利利利利利利利 \袴袴袴袴袴 (\�1컴컴컴컴컴컴컴컴컴40/) BOTTOM Notes on 80 pin I/O connector: pins 1 - 4 = +12v 41 - 44 = 12v GND 34 - 36 = +5v 74 - 76 = 5v GND 37 = SYNC 77 = LEDC 38 = MTRON 78 = DLYDST 39 = SCSIA0 79 = SCSIA1 40 = SCSIA2 80 = SCSIA3 �袴袴袴袴袴袴袴袴敲 � RIGHT SIDE VIEW � (Both ST-12400N and ST-12400NC) 훤袴袴袴袴袴袴袴袴� BACK 郞� J2 12345678 TOP (HDA) FRONT OF J1팠袴袴袴袴袴袴袴袴袴袴�P�W�A袴袴袴袴袴袴袴袴袴袴袴� OF DRIVE 突� :::::::: BOTTOM DRIVE 납납납납 쿟erminator Power 冒납납냅 Reserved 渼Terminator Power 켸납납읕 Start Delay (12 secs * ID) � Enable T-Res 컴冒냅컴 Motor Start � Parity Enable 컴켸읕컴 Write Protect � � � 旼컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴커 읕� Termination Power-source Table � 쳐컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컨컴컴컴컴컴컴커 � 1 2 1 2 1 2 � � 靈� 靈� A Drive Supplies Bus � � 빗빗 編編 廖퀑� B Drive Supplies Own � � 度쏵 咆鞭 度 鞭 C Bus Supplies Drive � � A B C � 넌袴袴....袴袴�....袴袴�PWA edge袴袴� � � � 읕컴컴횯efault컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴켸 �袴袴袴袴袴袴袴袴� � LEFT SIDE VIEW � (ST-12400N only) 훤袴袴袴袴袴袴袴暠 If these ID jumpers are used, then ID jumpers shown in front view ARE NOT USED. FRONT TOP (HDA) J5 郞�1� 郞퇑ACK OF 袴袴袴袴P�W�A袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴孤:::팠킞1 OF DRIVE BOTTOM 突袴� 突퐻RIVE 납� ID 1 켸냅� ID 4 ID 2 �袴袴袴袴袴袴� � FRONT VIEW � (Both ST-12400N and ST-12400NC) 훤袴袴袴袴袴暠 TOP (HDA) J6 郞袴袴1� 袴P�W�A袴袴袴袴袴袴袴袴袴袴袴袴袴�::::::팠 * BOTTOM 突袴袴槁 � 123456 LED 켸 납납납 ID 4 冒납냅 Reserved ID 2 켸납읕 Remote LED (pin-3 +5v) ID 1 컴牡컴 Spindle Synchronization (pin-6 REF SIG+) If these ID jumper are used, then ID jumpers shown in left side view J5 or 80 pin I/O cable ARE NOT USED. ST-12400N UNFORMATTED CAPACITY (MB) ________________2537 FORMATTED CAPACITY (xx SECTORS) (MB) _____2148 AVERAGE SECTORS PER TRACK ________________83 rounded down ACTUATOR TYPE ____________________________STRAIGHT ARM TRACKS ___________________________________49,799 CYLINDERS ________________________________2,621 user HEADS ______PHYSICAL______________________19 DISCS (3.5 in) ___________________________10 MEDIA TYPE _______________________________THIN FILM RECORDING METHOD _________________________ZBR RLL (1,7) TRANSFER RATE INTERNAL (mbits/sec)________26.8 to 45.6 SPINDLE SPEED (RPM) ______________________5,411 AVERAGE LATENCY (mSEC) ___________________5.54 BUFFER ___________________________________256/1024 KByte Read Look-Ahead, Adaptive, Multi-Segmented Cache INTERFACE ________________________________SCSI-2 FAST SECTORS PER DRIVE ________________________ TPI (TRACKS PER INCH) ____________________3000 AVERAGE ACCESS (ms) (read/write)__________9.0/10.5 Drive level without controller overhead SINGLE TRACK SEEK (ms) ___________________1 MAX FULL SEEK (ms) _______________________19 MTBF (power-on hours) ____________________500,000 POWER REQUIREMENTS: +12V START-UP (amps) _2.0 +12V TYPICAL (amps) __0.54 +5V START-UP (amps) __0.8 +5V TYPICAL (amps) ___0.43 TYPICAL (watts) ______9 MAXIMUM (watts) ______ WRITE PRECOMP (cyl) ______________________N/A REDUCED WRITE CURRENT (cyl) ______________N/A 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): 5.75/146.1 Weight (lbs/kg): 2.5/0.99 Already low-level formatted at the factory with twelve spare sectors per cylinder and two spare cylinders/unit. ZBR = Zone Bit Recording = Variable sectors per track Seagate reserves the right to change, without notice, product offerings or specifications. (08/20/93)