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Seagate ST12450W, Product Manual

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Seagate ST12450W Product Manual Download Page 45

ST12450W/WD Product Manual, Rev. A

35

8.0

Media characteristics

This section provides information regarding the media used in Barracuda 2,
2HP 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 ST12450W

Page 1: ...Barracuda 2 2HP Disc Drive ST12450W WD Product Manual Volume 1...

Page 2: ......

Page 3: ...Barracuda 2 2HP Disc Drive ST12450W WD Product Manual Volume 1...

Page 4: ...emarks 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 wit...

Page 5: ...nary 01 1 25 94 L Newman J Olson All A preliminary 02 2 15 94 L Newman J Olson All A 3 29 94 L Newman J Olson All Note Product Manual 83328900 is Volume 1 of a two volume document with the SCSI interf...

Page 6: ......

Page 7: ...stics 11 5 2 1 Seek time 13 5 2 2 Format drive command execution time 13 5 3 General performance characteristics 14 5 4 Start stop time 15 5 5 Prefetch multi segmented cache control 15 5 5 1 Adaptive...

Page 8: ...ive orientation 34 7 6 2 Cooling 34 8 0 Media characteristics 35 8 1 Media description 35 9 0 Defect and error management 37 9 1 Defects and errors 37 10 0 Option configuration headers 39 10 1 Drive I...

Page 9: ...gure 5 Synchronized reference signal characteristics 18 Figure 6 Air flow 23 Figure 7 GYHX temperature measurement locations 24 Figure 8 RYGX temperature measurement locations 25 Figure 9 Temperature...

Page 10: ......

Page 11: ...m Interface 2 SCSI 2 asdescribedintheANSISCSIandSCSI 2interfacespecificationstothe extent described in this manual This manual defines the performance characteristics of the Barracuda 2 2HP drives The...

Page 12: ......

Page 13: ...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 supplied as a...

Page 14: ......

Page 15: ...le initiators disconnect reconnect self configuring host software and automatic features that re lievethehostfromknowingthephysicalcharacteristicsofthetargets logical block addressing is used The head...

Page 16: ...ts potential damage to the heads and discsthatresultsfrommovementduringshippingandhandling Theshipping lock disengages when power is applied to the drive and the head load process begins Barracuda dri...

Page 17: ...ding 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 recording ZBR...

Page 18: ...command in the SCSI 2 Interface Product Manual part number 77738479 4 3 Options factory installed The capacity shown in Section 4 2 is normally provided Other capacities can be ordered depending on th...

Page 19: ...by enabling this feature with a jumper see Figure 14 External terminators are required for differential ST12450WD drives These external terminators must be provided by the user systemsintegrator or h...

Page 20: ......

Page 21: ...aptive thermal compensation is in process when a SCSI command is received the command is queued until the compensation for the specific head being compensated completes When compensation completes for...

Page 22: ...mplementation Start Has 10 min timer expired Set 10 minute 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...

Page 23: ...cal 8 0 9 0 9 0 10 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 orientati...

Page 24: ...0 to 20 Mbytes sec Read write consecutive sectors on a track Yes Flaw reallocation performance impact Negligible for flaws reallocated using the spare sectors per track reallocation scheme Flaw reallo...

Page 25: ...ace approximately960Kbytescanbe used as a cache The cache can be divided into logical segments from which data is read and to which data is written Thedrivekeepstrackofthelogicalblockaddressesofthedat...

Page 26: ...ansferred During a prefetch the drive crosses a cylinder boundary to fetch data only if the Discontinuity DISC bit is set to1in bit 4 of byte 2 of the Mode Select parameters page 8h Default is zero fo...

Page 27: ...re being written see the SCSI 2 Interface Product Manual If the number of write data logical blocks exceeds the size of the segment beingwrittenintowhentheendofthesegmentisreached dataiswritteninto th...

Page 28: ...page 4 byte 17 bits 1 and 0 RPL Description 00b Spindle synchronization is disabled default value 01b The target operates as a synchronized spindle slave 10b The target operates as a synchronized spin...

Page 29: ...s set to RPL Status Change You may operate the drive with a rotational skew when synchronized The rotationalskewisappliedintheretardeddirection laggingthesynchronized spindle master control A rotation...

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Page 31: ...6 1 1 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 d...

Page 32: ...n operated in an 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 per...

Page 33: ...ure 6 Air flow ST12450W shown Above unit 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 show...

Page 34: ...aluesmayadverselyaffectthedrive sabilitytomeet functional specifications Air flow cooling ST12450W single ended MTBF 500k hours Card Component Reference case temperature C GYHX tbd tbd tbd GYHX tbd tb...

Page 35: ...Figure 9 The air flow pattern with which the temperature guidelines above were generated is shown in Figure 6 Local average air velocities were 0 61 msec 120 lfpm and inlet air temperature to the driv...

Page 36: ...ion Guide 83328890 for installation instructions The drive has been 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 in...

Page 37: ...ximum 1 tbd tbd 1 65A 0 89A Maximum peak AC tbd tbd 2 5A 1 83A Track following at OD DC 1 tbd tbd 1 4A 0 74A ID DC 1 tbd tbd 1 4A 0 8A Read track OD DC 1 14 tbd tbd 1 9A 0 76A AC tbd tbd 2 5A 1 1A See...

Page 38: ...ndividualdrivepowerrequirementsshould be noted Where multiple units are powered on simultaneously the peak starting current must be available to each device 7 2 1 Conducted noise immunity Noise is spe...

Page 39: ...urrent profile T0 Power is applied to the drive T1 Controller self tests are performed T2 Thespindlebeginstoaccelerateundercurrentlimitingafterperforming internal diagnostics See Note 1 of Table 1 T3...

Page 40: ...pecifiedMTBF Theenclosureforthedriveshouldbedesignedsuchthat the temperatures at the locations specified in Figures 7 and 8 are not exceeded Air flow may be needed to achieve these temperatures Contin...

Page 41: ...k not exceeding 10 Gs at a maximum duration of 11 msec half sinewave Shockoccurringatabnormallevelsmaydegradeoperatingperformance during the abnormal shock period Specified operating performance conti...

Page 42: ...n 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 incur physical dama...

Page 43: ...0 265 2 145 1 755 145 80 101 60 41 14 15 68 101 60 6 35 44 45 95 25 60 20 137 69 141 35 151 58 4 826 8 81 43 82 104 14 4 83 0 381 8 50 54 48 44 58 A B C D E F G H J K L M N P R S T U V W Z max 0 010...

Page 44: ...vertical drive on its side orientations which are the two preferred mounting orientations Figure 12 Recommended mounting 7 6 2 Cooling Ensure that the enclosure you use provides adequate cooling so t...

Page 45: ...ing the media used in Barracuda 2 2HP disc drives 8 1 Media description The media used on the drive has a diameter of approximately 95 mm 3 7 inches Thealuminumsubstrateiscoatedwithathin filmmagneticm...

Page 46: ......

Page 47: ...ieflyoutlinedinthissection 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 ETF...

Page 48: ......

Page 49: ...e drives These option headers may be used to customize many functions of the drives for your particular system 10 1 Drive ID option select headers The headers described in this section enable you to c...

Page 50: ...dle 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 Pin 1 Pin 1 J4 J01 J5 J01 Pin 1 Pin 2 SSR...

Page 51: ...Start Unit command from the SCSI host No jumper installed causes the unit to look at the Delay Motor Start jumper Default is no jumper 7 8 Parity Disable option Jumper installed causes parity checkin...

Page 52: ...igitalTTLreferenceindexsignaland ground 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 driv...

Page 53: ...are used for connecting the reference index signal cable as shown in Figure 14 Pin 11 is SSREF and pin 12 is ground Figure 16 J5 configuration select header specification 10 3 Grounding Signal ground...

Page 54: ......

Page 55: ...ice reset 0Eh N Y Clear queue 00h Y Y Command complete 04h Y Y Disconnect 80h FFh Y Y Identify 23h N N Ignore wide residue two bytes 0Fh N N Initiate recovery 05h Y Y Initiator detected error 0Ah Y Y...

Page 56: ...Y Y Format Unit 1 07h Y Y Reassign Blocks 08h Y Y Read 0Ah Y Y Write 0Bh Y Y Seek 12h Y Y Inquiry N Y Vital Product Data Page N Y Unit Serial Number Page N Y Implemented Operating Def Page N Y Firmwar...

Page 57: ...Cache 36h N N Lock Unlock Cache 37h Y Y Read Defect Data 39h N N Compare 3Ah N N Copy and Verify 3Bh Y Y Write Buffer 2 3Ch Y Y Read Buffer 2 3Eh Y Y Read Long 3Fh Y Y Write Long 40h Y Y Change Defin...

Page 58: ...65 64 20 144 147 D D D D Copyright year changes with actual year 01 SCSI 1 implemented 02 SCSI 2 implemented default The drive can be changed between these two configurations 01 Response data is in SC...

Page 59: ...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 09 00 09 00 00 00 09 00 95 02 00 00 01 00 0D 00 1C 40 00 00 00 CHG 03 83 16 FF FF FF FF 00 00...

Page 60: ...1C 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 97 09 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 0...

Page 61: ...Disconnect reconnect Y Y Asynchronous data transfer Y Y Synchronous data transfer Y Y Synchronized locked spindle operation Y Y Differential interface circuits available Y Y Segmented caching N N Zero...

Page 62: ...s second 25 100 10 0 31 125 8 0 37 150 6 66 50 200 5 0 62 250 4 00 75 300 3 33 87 350 2 86 100 400 2 5 11 5 2 REQ ACK offset The maximum REQ ACK offset supported by Barracuda drives is 15 0Fh 11 6 DC...

Page 63: ...chdevice has the same type of drivers and receivers all single ended or all differen tial Devices having single ended interface circuits cannot be on the same daisy chain with devices having a differe...

Page 64: ...re satisfactory A characteristic impedance of 100 ohm 10 is recommended for unshielded flat or twisted pair ribbon cable To minimize discontinuities and signal reflections cables of different impedanc...

Page 65: ...ingle ended receiver with hyster esis gate or equivalent as a line receiver Figure 18 Single ended transmitters and receivers Notes 1 Part of active terminator circuits Enable drive termination when i...

Page 66: ...beterminatedateachend of thecable You must provide external termination for the differential drives Output characteristics Each signal driven by differential interface drives should have the followin...

Page 67: ...h power on or off and with the hysteresis equaling 35 mV minimum The input characteristics must additionally conform to EIA RS 485 1983 Figure 19 Typical differential I O line transmitter receiver and...

Page 68: ...er peripheral on the chain Note Remove the Enable Drive Terminator jumper on J4 pins 11 and 12 when terminators are not required ST12450WD Differential I O Barracuda drives do not have provisions to a...

Page 69: ...nnector 1 368 34 75 315 8 00 Position 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 Serie...

Page 70: ...D 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 ACK GROUND...

Page 71: ...IFFSENS 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 27...

Page 72: ...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 15 0 75 s Data to save...

Page 73: ...transfer 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...

Page 74: ......

Page 75: ...shipped individually require additional pro tection as provided by the single unit shipping pack 12 3 Drive termination ST12450W To enable internal drive termination install a jumper on J4 pins 11 and...

Page 76: ......

Page 77: ...l 13 1 Adaptor accessory frame kit Part number 75790701 This kit contains the frame to allow a 3 5 inch drive to be mounted in a 5 25 inch drive bay It includes mounting hardware front panel with a gr...

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Page 79: ...nical 34 current requirements 27 D data block size modifying the 8 data buffer 7 data buffer to from disc media 512 byte sector data transfer rate 1 track 14 data transfer rate sector 14 data heads nu...

Page 80: ...33 height 33 weight 33 width 33 media characteristics 35 media description 35 miscellaneous operating features supported 51 miscorrected data transferred 21 Mode Select command 15 Mode Sense data 48...

Page 81: ...ile 29 U UL 3 Reed Solomon error correction code 7 reference documents Barracuda 2 2HP Installation Guide 3 SCSI 2 Reference Manual 3 reference index signal 42 termination 43 reference signal 18 19 re...

Page 82: ...ined 21 unrecovered data transferred 21 V vibration non operating 32 operating abnormal 32 normal 32 VIC 2 LSI 18 voltage requirements 27 72 ST12450W WD Product Manual Rev A W write data caching 17 wr...

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Page 84: ...Seagate Technology Inc 920 Disc Drive Scotts Valley California 95066 4544 USA Publication Number 83328900 Rev A Printed in USA...

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