ST-12550N SCSI-2 Fast (Barracuda 2) +===========+ J01-----\ 1-\ -------J4-1--------------\ # REAR VIEW # (see 1|\ |"| | +===========+ below) \-/ |"| | |"|J4 1-11 | Terminating Resistors-\ |"|(see detail below) | /------\ /----|-\ |"| | (TOP) \------1 \------1 \"/-J4-11\ | #==========================/=========\ | | =#::::::::::::::::::::::::1#| 0 0 0 0 #= | | \======================|==#\-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) /--------------------------------\ | J01 - Terminator Power Jumpers +------------------\ \--------------------------------/ | Terminator power from the drive. #1-2# * (default) #o-o# o o Terminator power from pin 26 on the #-# * SCSI bus. o#o# o#o# Terminator to the SCSI bus on pin 26. #-# #o#o #o#o Terminator power to the SCSI bus and #-Ò-#* drive. #o#o# #o#o+ * 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 __________________________50,888 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 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. (08/08/94) disk_type = "Seagate ST12550N" \ : ctlr = MD21 : fmt_time = 4 \ : cache = 0x0 : trks_zone = 19 : asect = 9 : atrks =19 \ : ncyl = 2747 : acyl = 2 : pcyl = 2708 : nhead = 19 : nsect = 80 \ : rpm = 7200 : bpt =40960