Seagate Barracuda ST11950N Product Manual Download Page 51

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Barracuda 1 and 2 Product Manual, Rev. C

8.0

Media characteristics

This section provides information regarding the media used in Barracuda 1
and 2 disc drives.

8.1

Media description

The media used on the drive has a diameter of approximately 95 mm (3.7
inches). The aluminum substrate is coated with a thin-film magnetic material,
which has a proprietary protective layer for improved durability and environ-
mental protection.

Summary of Contents for Barracuda ST11950N

Page 1: ...Barracuda 1 and 2 Disc Drive ST11950N ND ST11950W WD ST12550N ND ST12550W WD Product Manual Volume 1...

Page 2: ......

Page 3: ...Barracuda 1 and 2 Disc Drive ST11950N ND ST11950W WD ST12550N ND ST12550W WD Product Manual Volume 1...

Page 4: ...ademarks of Seagate Technology Inc Barracuda is a trademark of Seagate Technology Inc Other product names are registered trademarks or trademarks of their owners Seagate reserves the right to change w...

Page 5: ...us summary sheet Sheets Revision Date Writer Engineer Affected A preliminary 01 04 05 93 L Newman J Olson All A preliminary 02 04 20 93 L Newman J Olson All A preliminary 03 05 01 93 L Newman J Olson...

Page 6: ......

Page 7: ...time 13 5 2 2 Format drive command execution time 13 5 3 General performance characteristics 14 5 4 Start stop time 14 5 5 Prefetch multi segmented cache control 15 5 5 1 Adaptive read lookahead 16 5...

Page 8: ...6 1 Drive orientation 40 7 6 2 Cooling 40 8 0 Media characteristics 41 8 1 Media description 41 9 0 Defect and error management 43 9 1 Defects and errors 43 10 0 Option configuration headers 45 10 1 D...

Page 9: ...ons 24 8 UYFX temperature measurement locations 25 9 TYGX temperature measurement locations 26 10 PYGX temperature measurement locations 27 11 Temperature measurement location 27 12 Barracuda 1 and 2...

Page 10: ...fault values SCSI 2 implementation 58 8 Mode Sense data ST12550 default values SCSI 1 implementation 59 9 Mode Sense data ST12550 default values SCSI 2 implementation 60 10 SCSI bus conditions and oth...

Page 11: ...nterface specifications to the extent described in this manual The SCSI 2 Interface Product Manual part number 77738479 describes general SCSI interface characteristics of this and other families of S...

Page 12: ...2 Barracuda 1 and 2 Product Manual Rev C...

Page 13: ...by law 2 1 Standards The Barracuda disc drive is a UL recognized component per UL1950 CSA certified to CSA C22 2 No 950 M89 and VDE certified to VDE 0805 and EN60950 The Barracuda disc drive is suppli...

Page 14: ...4 Barracuda 1 and 2 Product Manual Rev C...

Page 15: ...ysicalcharacteristicsofthetargets logical block addressing is used The head and disc assembly HDA is sealed at the factory Air circulates within the HDA through a non replaceable filter to maintain a...

Page 16: ...matic shipping lock prevents potential damage to the heads and discs The shipping lock disengages when power is applied to the drive and the head load process begins Barracuda drives decode track 0 lo...

Page 17: ...head landing zone Automatic shipping lock Automatic thermal compensation Embedded Grey Code track address to eliminate seek errors Self diagnostics performed at power on 1 1 interleave Zone bit recor...

Page 18: ...en lens part number 70869751 Thestandardfrontpanelisblackplastic Youmayorderothercolors Each panel has a single rectangular green LED indicator lens that when glowing indicates the drive is selected B...

Page 19: ...W drives see Sections 10 1 and 11 7 3 4 External terminators are required for ST11950ND ST11950WD ST12550ND and ST12550WD drives These external terminators must be provided by the user systems integra...

Page 20: ...10 Barracuda 1 and 2 Product Manual Rev C...

Page 21: ...activeSCSI command If adaptive thermal compensation is in process when a SCSI command is received the command is queued until compensation completes When compensation completes for the head the first...

Page 22: ...ute timer Yes No Yes A Is SCSI command in progress No Complete Command Seek to TCAL cyl and select head zero TCAL head Has target received a SCSI command No Yes All heads calibrated Yes A All heads ca...

Page 23: ...0 Single track typical 0 6 0 9 1 6 1 9 Full stroke typical 17 19 18 0 20 0 Typical seek values are measured under nominal conditions of tempera ture voltage and horizontal orientation on a representa...

Page 24: ...h 0 7 msec Overhead time for one track cylinder switch 1 6 msec typical Average rotational latency 4 17 msec Rate measuredfrom the start of the first sector transfer to or from the host Assumes system...

Page 25: ...tiator on subsequent read commands This is referred to as the prefetch operation Since data that is prefetched may replace data already in the cache segment an initiator can limit the amount of prefet...

Page 26: ...che s overall performance allowing a wide range of user selectable configurations including a pure prefetch strategy 5 5 1 Adaptive read lookahead Read lookahead causes the drive to continue reading d...

Page 27: ...of atwisted pair cable which connects the drives in the synchronized system in a daisy chain configuration as shown in Figure 4 Figure 4 Synchronized drive interconnect diagram The host can reconfigur...

Page 28: ...ed 20 microseconds T 1 0 sec min 1 37 sec max 0 1 SSREF Figure 5 Synchronized reference signal characteristics SCSI interface factors The Rotational Position Locking RPL field in byte 17 bits 0 and 1...

Page 29: ...lects 40h FFh or 1 4 of a revolution lagging skew 80h selects 1 2 of a revolution lagging skew etc Since the drive supports all offset values from 0 to 255 values sent by the initiator are not rounded...

Page 30: ...20 Barracuda 1 and 2 Product Manual Rev C...

Page 31: ...Environmental interference When evaluating system operation under conditions of electromagnetic interference EMI the performance of the drive within the system is considered acceptable if the drive do...

Page 32: ...n average local disc drive ambient temperature of 95 F 35 C or less Short term excursions up to the specification limits 122 F 50 C of the operating environment will not affect MTBF performance The fo...

Page 33: ...nit Under unit Note Air flows in the direction shown back to front or in reverse direction front to back Above unit Under unit Note Air flows in the direction shown or in reverse direction side to sid...

Page 34: ...550N single ended drives MTBF 500k hours Card Component Reference case temperature C TYFX Transmitter U5 57 TYFX Writer U35 66 TYFX LSI U4 60 TYFX VIC2 U20 59 TYFX 1021 U55 57 HDA housing Figure 11 48...

Page 35: ...LSI U4 60 UYFX VIC2 U20 59 UYFX 1021 U55 57 HDA housing Figure 11 48 The air flow pattern with which the temperature guidelines above were generated is shown in Figure 6 opposite direction Local aver...

Page 36: ...X LSI U4 60 TYGX VIC2 U20 59 TYGX 1021 U55 57 HDA housing Figure 11 48 The air flow pattern with which the temperature guidelines above were generated is shown in Figure 6 opposite direction Local ave...

Page 37: ...Figure 11 48 The air flow pattern with which the temperature guidelines above were generated is shown in Figure 6 opposite direction Local average air velocity was 0 61 msec 120 lfpm and inlet air te...

Page 38: ...low level formatted at the factory and does not need to be reformatted 6 2 7 Service tools No special tools are required for site installation or recommended for site maintenance RefertoSection6 2 3...

Page 39: ...east 1 millisecond before coming into contact with the bus connector Maintain these ground connections during and after con necting the device to the bus b If you are removing the device maintain its...

Page 40: ...30 Barracuda 1 and 2 Product Manual Rev C...

Page 41: ...s ST11950N ST11950ND ST12550N ST12550ND 5V 8 12V 5V 8 12V Voltage regulation 5 Notes 5 5 2 5 5 2 Amps Max operating current DC 3 1 1 1 0 95 1 5 0 95 Avg idle current OD DC X 1 9 1 0 0 84 1 1 0 84 Max...

Page 42: ...ng Typical DC X 1 10 1 0 1 2 1 1 1 2 Maximum DC 3 1 1 1 1 2 1 2 1 2 Maximum peak AC 3 1 2 1 8 2 0 1 8 Notes 1 Measured with average reading DC ammeter Instantaneous 12V current peaks will exceed these...

Page 43: ...ltiple units are powered on simultaneously the peak starting current must be available to each device 7 2 1 Conducted noise immunity Noise is specified as a periodic and random distribution of frequen...

Page 44: ...current profiles T0 Power is applied to the drive T1 Controller self tests are performed T2 Thespindlebeginstoaccelerateundercurrentlimitingafterperforming internal diagnostics See Note 1 of Table 1 T...

Page 45: ...rature of 95 F 35 C Occasional excursions to drive ambient temperatures of 122 F 50 C may occur without impact to specifiedMTBF Theenclosureforthedriveshouldbedesignedsuchthat the temperatures at the...

Page 46: ...ration does not incur physical damage while subjected to intermittent shock not exceeding 10 Gs at a maximum duration of 11 msec half sinewave Shockoccurringatabnormallevelsmaydegradeoperatingperforma...

Page 47: ...e X Y or Z axis c Non operating The limits of non operating vibration apply to all conditions of handling and transportation This includes both isolated drives and integrated drives The drive does not...

Page 48: ...M 3 N C P B S H G J Notes 1 2 3 4 Inches Millimeters 5 740 4 000 1 620 615 4 000 250 1 750 3 750 2 370 5 420 5 565 5 965 195 360 1 725 4 100 190 0 015 145 80 101 60 41 14 15 68 101 60 6 35 44 45 95 25...

Page 49: ...81 6 73 A B C D E F G H J K L M N P R S T U V max 0 010 0 010 0 028 0 020 0 005 0 005 0 010 0 010 0 010 0 020 0 010 0 035 0 015 0 015 0 010 0 010 0 010 0 020 max 25 25 68 50 13 13 25 25 25 50 25 90 38...

Page 50: ...ve on its side orientations which are the two preferred mounting orientations Figure 15 Recommended mounting ST11950N shown 7 6 2 Cooling Ensure that the enclosure you use provides adequate cooling so...

Page 51: ...rding the media used in Barracuda 1 and 2 disc drives 8 1 Media description The media used on the drive has a diameter of approximately 95 mm 3 7 inches Thealuminumsubstrateiscoatedwithathin filmmagne...

Page 52: ...42 Barracuda 1 and 2 Product Manual Rev C...

Page 53: ...ebrieflyoutlinedinthissection References to other sections are provided when necessary 9 1 Defects and errors Identified defects are recorded on the drive s defects list referred to as the primary or...

Page 54: ...44 Barracuda 1 and 2 Product Manual Rev C...

Page 55: ...y functions of the drives for your particular system 10 1 Drive ID option select headers The headers described in this section enable you to configure the drive to meet specific functionality requirem...

Page 56: ...Protect Remote LED Connector Reserved Spindle Sync Cable Connector Term Power from Drive Term Power from SCSI Bus Term Power to SCSI Bus Term Power to SCSI Bus and Drive Power Connector SCSI Connector...

Page 57: ...rive Default is no jumper 9 10 DelayMotorStartoption Jumperinstalledcauses the drive to wait ten 10 seconds for each target ID number before starting the spindle automati cally Default is no jumper Ex...

Page 58: ...ync Cable Connector Term Power from Drive Term Power from SCSI Bus Term Power to SCSI Bus Term Power to SCSI Bus and Drive Power Connector SCSI Connector Pin 1 Pin 1 J4 J01 J5 J01 Pin 1 Pin 2 Position...

Page 59: ...X 10 30 Target spindle motor starts after thirty 30 seconds 5 6 Enable Motor Start option Jumper installed causes the target to wait for the Start Unit com mand from the SCSI host No jumper installed...

Page 60: ...d The reference index signal SSREF is an output if the drive is configured as a master and is an input otherwise The reference index signal is connected from drive to drive in a daisy chain fashion as...

Page 61: ...nnector Only pins 1 and 2 are used for connecting the reference index signal cable as shown in Figure 17 Pin 1 is SSREF and pin 2 is ground 866 22 mm 079 2 mm 079 2 mm 787 20 mm J04 Figure 21 ST11950N...

Page 62: ...connection Maximiz ing the conductive contact area between HDA ground and system ground may reduce radiated emissions If you do not want to connect HDA ground to the system chassis you must provide a...

Page 63: ...ce reset 0Ch Y Y Clear queue 0Eh N Y Command complete 00h Y Y Continue I O Process 12h N N Disconnect 04h Y Y Extended messages 01h Y Y Identify 80h FFh Y Y Ignore wide residue two bytes 23h N N Initi...

Page 64: ...bers Page N Y Implemented Operating Def Page N Y Jumper Settings Page N Y Unit Serial Number Page N Y Vital Product Data Page N Y Lock Unlock Cache 36h N Y Log Select 4Ch N N Log Sense 4Dh N N Mode Se...

Page 65: ...N Extended Sense Y Y Field Pointer Bytes Y Y Reserve 16h Y Y Extent Reservation N N Third Party Reserve Y Y Rezero Unit 01h Y Y Search Data Equal 31h N N Search Data High 30h N N Search Data Low 32h N...

Page 66: ...onfigurations 01 Response data is in SCSI 1 format and has compatibility with Common Command Set data 02 Response data is in SCSI 2 format default The drive can be changed between these two configurat...

Page 67: ...00 DEF 02 82 0A 80 80 00 0A 00 00 00 00 00 00 CHG 02 82 0A FF FF 00 00 00 00 00 00 00 00 DEF 03 83 16 00 0F 00 06 00 00 00 0F 00 51 02 00 00 01 00 07 00 10 40 00 00 00 CHG 03 83 16 FF FF FF FF 00 00 F...

Page 68: ...10 40 00 00 00 CHG 03 83 16 FF FF FF FF 00 00 FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 DEF 04 84 16 00 0A 93 0F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 20 00 00 CHG 04 84 16 00 00 00 00 00...

Page 69: ...00 DEF 02 82 0A 80 80 00 0A 00 00 00 00 00 00 CHG 02 82 0A FF FF 00 00 00 00 00 00 00 00 DEF 03 83 16 00 13 00 09 00 00 00 13 00 51 02 00 00 01 00 07 00 10 40 00 00 00 CHG 03 83 16 FF FF FF FF 00 00 F...

Page 70: ...10 40 00 00 00 CHG 03 83 16 FF FF FF FF 00 00 FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 DEF 04 84 16 00 0A 94 13 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 20 00 00 CHG 04 84 16 00 00 00 00 00...

Page 71: ...cation Y Y Attention condition N Y Contingent allegiance condition N Y Deferred error handling Y Y Differential interface circuits available Y Y Disconnect reconnect Y Y Parameter rounding controlled...

Page 72: ...onous data transfer periods for ST11950N ND and ST12550N ND drives M Transfer period Transfer rate decimal M times 4 nanoseconds mega transfers second 25 100 10 0 31 125 8 0 37 150 6 66 50 200 5 0 62...

Page 73: ...eet SELV safety extra low voltage as defined in IEC 950 Pins 1 12V DC 2 12V DC return 3 5V DC return 4 5V DC 1 2 3 4 11 7 SCSI physical interface Figures 23 and 24 illustrate the physical interface on...

Page 74: ...sy chained together when using a non wide bus andST11950N ND orST12550N ND drives A maximum of 16 SCSI devices including the host may be daisy chained together when using a wide bus and ST11950W WD or...

Page 75: ...reshown in Table 14 Differential I O cable pin assignments for ST11950WD and ST12550WD drives are shown in Table 16 11 7 1 2 3 General cable characteristics Note Use only non shielded cable connectors...

Page 76: ...ion 11 7 3 3 ST11950ND ST11950WD ST12550NDandST12550WDdrivesusediffer entialinterfacesignals Eachofthesesignalsmustbeterminatedateachend of the total cable with 330 ohms to 5V and 330 ohms to ground w...

Page 77: ...drive terminator power is VR1 which has an input source voltage selected by a jumper 11 7 3 2 Differential drivers and receivers Typical differential driver and receiver circuits used by ST11950ND ST1...

Page 78: ...rent on either input 2 0 milliamps maximum includes both receivers and passive drivers This requirement is met with the input voltage varying between 7V DC and 12V DC with power on or off and with the...

Page 79: ...in the daisy chain must be active terminators as described above ST11950W and ST12550W drives Internal disc drive I O termination consists of active circuits contained in permanently mounted IC termi...

Page 80: ...drive to the SCSI bus see Section 10 1 11 8 SCSI non wide physical interface 1 2 3 4 100 2 54 D 010 Typ 045 1 14 C 010 B Ref A 010 834 010 21 18 Min Typ 3 051 1 30 16 4 06 100 2 54 025 64 Sq Contact...

Page 81: ...DB 7 16 MSG 42 DB P 18 SEL 44 GROUND 20 C D 46 GROUND 22 REQ 48 GROUND 24 I O 50 TERMPWR 26 Notes 1 All odd pins except pin 25 are connected to ground Pin 25 is left open Caution Do not connect pin 2...

Page 82: ...B 2 DB 3 9 10 DB 3 DB 4 11 12 DB 4 DB 5 13 14 DB 5 DB 6 15 16 DB 6 DB 7 17 18 DB 7 DB P 19 20 DB P DIFFSENS 21 22 GROUND GROUND 23 24 GROUND TERMPWR 25 26 TERMPWR GROUND 27 28 GROUND ATN 29 30 ATN GRO...

Page 83: ...ion 1 Position 1 4 Position Power Header Commercial Mate N Lock 12 Position Auxiliary Shrouded Post Header AMPMODU 2mm 68 Position SCSI Receptacle AMPLIMITE 050 Series 403 10 24 033 84 Typ 010 25 Typ...

Page 84: ...P GROUND 15 49 GROUND GROUND 16 50 GROUND TERMPWR 17 51 TERMPWR TERMPWR 18 52 TERMPWR RESERVED 19 53 RESERVED GROUND 20 54 GROUND GROUND 21 55 ATN GROUND 22 56 GROUND GROUND 23 57 BSY GROUND 24 58 AC...

Page 85: ...DIFFSENS 16 50 GROUND TERMPWR 17 51 TERMPWR TERMPWR 18 52 TERMPWR RESERVED 19 53 RESERVED ATN 20 54 ATN GROUND 21 55 GROUND BSY 22 56 BSY ACK 23 57 ACK RST 24 58 RST MSG 25 59 MSG SEL 26 60 SEL C D 2...

Page 86: ...t Identify MSG to data media T16 4 5 11 Command dependent Data to status T17 4 5 15 Command dependent Status to command complete MSG T18 4 5 5 8 15 1 0 s Command complete MSG to bus free T19 4 5 5 8 1...

Page 87: ...sfer T32 4 5 5 7 0 09 s 0 04 s 4 5 8 14 15 MSG OUT byte transfer T33 4 5 2 0 04 s STATUS byte transfer T34 4 5 5 8 0 04 s 4 5 15 Synchronous data transfer characteristics Request signal transfer perio...

Page 88: ...78 Barracuda 1 and 2 Product Manual Rev C...

Page 89: ...72 single ended 71 cable requirements 64 cache control 15 caching write data 16 capacities formatted 8 unformatted 8 conducted noise immunity 33 contact assignments differential P cable 75 single end...

Page 90: ...nt 31 32 option configuration headers 45 EMC regulatory requirements meeting 3 Enable Drive Terminator 49 Enable Motor Start option 47 49 environmental interference 21 environmental limits effective a...

Page 91: ...eed 11 rotational latency average 11 position locking 18 skew operating the drive with 19 S safety agencies certification 3 safety regulatory agency compliance 3 SCSI bus conditions and misc features...

Page 92: ...7 spindle 7 T temperature operating 35 terminating differential drivers receivers 66 SCSI devices 64 single ended drivers receivers 66 terminator power 47 49 69 requirements 69 terminator power optio...

Page 93: ...Barracuda 1 and 2 Product Manual Rev C 83...

Page 94: ...Seagate Technology Inc 920 Disc Drive Scotts Valley California 95066 4544 USA Publication Number 83327780 Rev C Printed in USA...

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