Seagate ST3655N Manuel

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For all mode pages:• If the changeable value is 0, the initiator cannot change the bit directly.If the changeable value is 1, the initiator can change

C.1 Error Recovery page (01H)The Error Recovery page is shown below. This table summarizes thefunction, the default value, and the changeability of ea

Byte 2continuedWhen the Automatic Read Reallocation Enabled (ARRE)bit is 1, the drive automatically reallocates bad blocks de-tected while reading fro

Byte 5 The head offset count is not implemented. Head offsetsare performed as part of the drive’s retry algorithms.Byte 6 The data strobe offset count

Byte 2 The buffer full ratio field indicates, on Read commands,how full the drive’s buffer is before reconnecting. The driverounds up to the nearest w

C.3 Format Device page (03H)The Format Device page is shown below. This table summarizes thefunction, the default value, and the changeability of each

BitByte7 6 5 4 3 2 1 020 SSEC HSEC RMB SURFReserveddefault 1 0 0 0changeable 0 0 0 0 0 0 0 021–23 (default) Reserved (000000H)changeable 000000HBytes

Bytes 10–11 The sectors per track field indicates the number of physi-cal sectors the drive allocates per track. The drive reportsthe average number o

Byte 20 The drive type field bits are defined as follows:The Soft Sectoring (SSEC) bit is set to 1. This bit isreported as not changeable.

C.4 Rigid Disc Geometry page (04H)The Rigid Disc Geometry page is shown below. This table summarizesthe function, the default value, and the changeabi

1.0 Specifications summary1.1 Formatted capacityThe capacities specified here do not include spare sectors and cylinders.The media contains one spare

Bytes 2–4 The number of cylinders field specifies the number ofuser-accessible cylinders, including two spare cylindersset aside for defects. The

C.5 Caching page (08H)The drive uses read look-ahead, read caching and write caching toimprove seek times and performance.C.5.1 Read look-ahea

C.5.2 Write caching and write mergingWrite caching. The drive uses the write segment to store write com-mands and data. After the drive caches the com

BitByte7 6 5 4 3 2 1 013 Number of cache segmentsdefault 0 0 0 0 0 0 0 1changeable 1 1 1 1 1 1 1 114–15 (default) Cache segment size (0000H)changeable

Byte 2continuedWhen the Multiplication Factor (MF) bit is 0, the driveinterprets the minimum prefetch and maximum prefetchfields as the number of

When the Disable Read-Ahead (DRA) bit is 1, the drivedoes not read into the buffer any logical blocks beyondthe addressed logical blocks. When the DRA

C.6 Control Mode page (0AH)The Control Mode page is shown below. This table summarizes thefunction, the default value, and the changeability of ea

Bytes 8–9 The busy timeout period field contains the maximumpossible value, which means that the drive can remainbusy an unlimited amount of tim

C.7 Notch page (0CH)The Notch page contains parameters that describe the notches. Thetable below summarizes the function, default value, and the chang

Byte 2 The notched drive (ND) bit is always 1, which means thedisc contains notches of different recording densities. Foreach supported active notch v

1.3 Functional specificationsInterface Fast SCSI-2Zone Bit Recording method RLL (1,7)External data transfer rate(Mbytes per sec, avg)5.0 asynchronous

C.8 Cache Control page (38H)The Cache Control page is shown below. This table summarizes thefunction, the default value and the changeability of each

Byte 5 The maximum prefetch multiplier field always contains thesame value as byte 9 of the Caching page. The initiatorcannot directly change this byt

C.9 Soft ID Page (EEPROM) (3CH)The Soft ID page is shown below. This table summarizes the function,the default value and the changeability of each bit

When the param enable bit is 0, the drive does not check parity.When the param enable bit is 1, the drive checks parity. This bitis only valid if the

Appendix B.3. When the usage bit is 0, the warning message isdisabled. If requested, the EEPROM data and the write counteris updated even after the wr

Appendix D. Inquiry dataWhen the initiator issues an Inquiry command, the drive returns either ofthe following two types of data, depending on the val

Byte 0 The peripheral qualifier field contains zero, which meansthat the drive is currently connected to the logical unit thatis issuing the Inquiry c

The CmdQue bit is one, which means that the drivesupports tagged command queuing.The Soft Re bit is zero, which means that the driverespond

D.2 Vital product data pagesWhen the initiator issues an Inquiry command, and the EVPD bit in byte 1of the Inquiry command descriptor block is 1

D.2.1 Unit Serial Number page (80H)The Unit Serial Number page is shown below. The table summarizes thefunction and the default value of each bit.BitB

1.6 AcousticsSound pressure is measured at idle from 1 meter above the drive topcover.Sound pressure, typ 34 dBASound pressure, max 38 dBA1.7 Seek tim

D.2.2 Implemented Operating Definition page (81H)The Implemented Operating Definition page is shown below. The tablesummarizes the function and the de

D.2.3 Firmware Numbers page (C0H)The Firmware Numbers page is shown below. The table summarizes thefunction, and default value of each bit.BitByte7 6

D.2.4 Date Code page (C1H)The Date Code page is shown below. The table summarizes the functionand the default value of each bit.BitByte7 6 5 4 3 2 1 0

Appendix E. Timing diagramsFigure 11. Arbitration, selection (without ATN) and commandDescription Symbol Typical MaxTarget select time (without ar

Figure 12. Arbitration, selection (with ATN) and message outDescription Symbol Typical MaxTarget select time (without arbitration)T00<1.0 µsec

Figure 13. Identify message out to commandDescription Symbol TypicalIdentify message to command T04<150 µsec–ATN–SEL–BUSY–I/O–MSG–C/D–REQ–ACKT0410

Figure 14. Command descriptor block transferDescription Symbol Typical MaxCommand byte transfer T22<0.08 µsec 0.15 µsecNext command byte access

Figure 15. Command, status, command complete messageand bus freeDescription Symbol Typical MaxCommand to status T05 Command dependentStatus to command

Figure 16. Last command byte, disconnect message, bus freeand reselectionDescription Symbol Typical MaxCommand to disconnect messageT09 Command dep

Figure 17. Arbitration, reselection and message inDescription Symbol Typical MaxTarget wins arbitration (for reselect)T12<6 µsec—Arbitration to

You can pre-empt the automatic compensation by issuing a Rezero Unitcommand (01H). The drive performs the thermal calibration and then setsa timer and

Figure 18. Reselection, status, command complete and bus free Description Symbol Typical MaxReselect identify message to statusT15<150 µsec—Stat

Figure 19. Last command byte to data inDescription Symbol Typical MaxCommand to data in or parameter inT06 Command dependent10–DB(7–0,P)–ATN–SEL–B

Figure 20. Last command byte to data outDescription Symbol Typical MaxCommand to data out or parameter outT07 Command dependentCommand to data

Figure 21. Reselect identify message to data inDescription Symbol Typical MaxReselect identify message to data (media)T16 Command dependent–DB(0–7,

Description Symbol Typical MaxData in block transfer (ASYNC) T24<0.1 µsec 0.2 µsecNext data in byte access (ASYNC)T26<0.8 µsec 1.5 µsecData i

Figure 23. Data out block transferDescription Symbol Typical MaxData out block transfer (ASYNC) T25<0.1 µsec 0.2 µsecNext data out byte access (

Figure 24. Last data byte, save pointer message and disconnect messageDescription Symbol Typical MaxDisconnect message to bus freeT10<100 µsec—

Figure 25. Data in, status, command complete message and bus freeDescription Symbol Typical MaxData to status T17 Command dependentStatus to command c

Figure 26. Synchronous read timingDescription Symbol MinI/O low to data bus enable T1 400 nsecData bus valid to REQ– lowT2 57.5 nsecREQ– assertion per

Figure 27. Synchronous write timingDescription Symbol Min MaxI/O high to data bus disable T1 — 50 nsecREQ– assertion period T2 30.0 nsec —REQ– deasser

1.9 Shock and vibrationAll shock and vibration specifications assume that the drive is mounted in arecommended mounting configuration, as shown in Fig

Seagate Technology, Inc.920 Disc Drive, Scotts Valley, California 95066, USAPublication Number: 36243-001, Rev. A, Printed in USA

b.b. If a jumper is installed on pins 3 and 4 of the options jumper block,the remote start option is enabled. The drive begins to spin upwhen the host

1.11 DC powerExcept during the write procedure, you can apply power to the drive orremove power from the drive in any sequence without losing data ord

• Idle. The drive spindle motor is up to speed and the servo electronicsare active. The heads are on track, ready to accept and execute anycommand wi

T1 Voltage is applied to the drive.T2 After a delay, the startup current is applied and the spindlebegins to turn.T3 The accelerating current is appli

1.12 Agency listingsThis drive is listed by agencies as follows:• Recognized in accordance with UL 478 and UL 1950• Certified to CSA C22.2 No. 220-M19

If necessary, you should consult your dealer or an experienced radio/tele-vision technician for additional suggestions. You may find helpful thefollow

2.0 Hardware and interfaceThe SCSI-2 interface consists of a 9-bit bidirectional bus (8 data bits and1 parity bit) plus 9 control signals supporting

• Do not touch the connector pins or the printed circuit board. Do nottouch the printed circuit cable between the circuit board and thehead/

2.4 SCSI connectorYou can daisy-chain the drive with a maximum of seven other SCSIdevices (including the host) that have single-ended drivers and rec

In Figure 2, units are shown in inches (mm).0.100 (2.54) 0.038 (0.97)0.100 (2.54)0.039 (0.99)2.680 ± 0.015 (68.07 ± 0.38)Polarizing keyTriangle indica

The drive connector is a nonshielded, 50-pin connector consisting of tworows of 25 pins with adjacent pins 0.100 inches apart. The connector iskeyed w

2.4.1 SCSI connector pin assignmentsIn the table below, a minus sign indicates active low.Signal name Signalpin numberGroundpin numberDB(0)– 2 1DB(1)–

2.5 Cable requirementsThe characteristic impedance of the cable should be between 90 ohmsand 140 ohms. However, most available cables have a somewhat

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2.7 DC power connectorThe drive is equipped with a 4-pin power connector as shown in Figure 7on page 25.2.8 TerminatorsThe interface is terminated wit

2.8.2 Passive terminationAll interface signals with the drive are single-ended and must be termi-nated with 220 ohms to +5V and 330 ohms to ground at

2.8.2.1 Single-ended drivers and receiversThe drive uses single-ended drivers and receivers. Schematic repre-sentations of the removable terminat

2.9.2 Start/stop optionWhen a jumper is installed on pins 3 and 4 of the options jumper block,the drive waits for a Start/Stop Unit command fr

43SCSI ID = 0SCSI ID = 1SCSI ID = 2SCSI ID = 3SCSI ID = 7SCSI ID = 4SCSI ID = 5SCSI ID = 6MSB21J5. SCSI IDjumper blockJ4. I/O connector(pin 1)Circ

MSBJ8. User-configuration jumper block1112910785634131412Circuit board1234567891011–20SCSI ID bit 2 (MSB)GroundSCSI ID bit 1Groun

2.9.5 Active/passive termination jumper blockTo select active termination (the default), install a jumper on pins 1 and 2of the active/passive termina

The spindle-synchronization characteristics can be controlled by theMode Select command using the RPL bits in byte 17 of the Rigid DiscGeometry

2.12 Drive mountingYou can mount the drive in any orientation. Follow the guidelines belowappropriate to the set of mounting holes you elect to use: e

InterfaceconnectorPowerconnectorFigure 9. Drive mounting orientationsST3655 Family SCSI Drives Product Manual, Rev. A 29

© 1994 Seagate Technology, Inc. All rights reservedPublication Number: 36243-001, Rev. A18 January 1994Seagate®, Seagate Technology® and the Seagate l

In the following figure, all dimensions are in inches (mm).2.362 ± 0.010(59.944 ± 0.254)4.02 (102.11) max5.77 (146.56) max 3.750 ± 0.010 (95.250 ± 0.2

3.0 Command setThe drive supports a subset of the Group 0 and Group 1 standard SCSIcommands. The commands are described in this section.3.1 Command d

3.2 Status byte codesAfter the drive terminates each command, the drive sends the status byte(shown below) to the initiator during the status phase, u

3.3 Supported commandsThe drive supports the commands listed below.Group 0 commands Operation codeTest Unit Ready 00HRezero Unit 01HRequest Sense 03HF

3.4 Group 0 commands3.4.1 Test Unit Ready command (00H)The Test Unit Ready command verifies that the drive is ready; it is not arequest for a self-tes

3.4.3 Request Sense command (03H)The Request Sense command requests that the drive transfer sense datato the initiator in the additional sense data fo

3.4.4 Format Unit command (04H)The Format Unit command formats the disc so that all of the user-ad-dressable data blocks can be accessed. In addition,

3.4.4.1 Types of defectsThe categories of flawed sectors are described below. This defect list iscontrolled by byte 1 of the defect list header descri

Byte 1 of CDBDescriptionBit 4 Bit 3 Bit 2–Bit 0FmtDataCmpLstDefect listformat0 0 X X XDefault format. The initiator does notsend the defect list heade

3.4.4.3 Defect list header and defect listThe defect list, shown below, contains a 4-byte header, followed by oneor more defect descriptors. Byte 1 of

Contents1.0 Specifications summary . . . . . . . . . . . . . . . . . . . . 11.1 Formatted capacity . . . . . . . . .

3.4.4.4 Defect descriptor—bytes-from-index formatDefects are specified in the bytes-from-index format when the defect listformat field is 100Binary.

3.4.4.5 Defect descriptor—physical sector formatDefects are specified in the physical sector format when the defect listformat field is 101Binary. S

3.4.5 Reassign Blocks command (07H)When the drive receives the Reassign Blocks command, it reassignsdefective logical blocks to available spare sector

3.4.5.1 Reassign blocks defect listThe Reassign Blocks defect list contains a four-byte header followed byone or more defect descriptors. The length o

3.4.6 Read command (08H)When the drive receives the Read command, it transfers data to theinitiator. The Error Recovery page (01H) determines how the

3.4.7 Write command (0AH)When the drive receives the Write command, it writes the data from theinitiator to the disc. The drive receives all the write

Byte 4 The transfer length specifies the number of contiguouslogical blocks of data to be transferred. A transfer length ofzero indicates that 2

3.4.9 Inquiry command (12H)When the drive receives the inquiry command, it asserts the data-inphase and sends 68 bytes of inquiry data to the

3.4.10 Mode Select command (15H)The Mode Select command allows the initiator to change parametersstored in the mode pages. The mode pages are describe

If the drive detects invalid parameter data during the Mode Selectcommand, the drive sends a sense key of illegal request with ana

2.5 Cable requirements . . . . . . . . . . . . . . . . . . . . . 192.6 Single-ended cable . . . . . . . . . . . .

3.4.10.1 Mode Select parameter listThe Mode Select parameter list contains a 4-byte header, followed by a1-block descriptor (if any), followed by the

3.4.11 Reserve command (16H)When the initiator issues a Reserve command, it requests that the drivebe reserved for exclusive use by the initiator unti

3.4.12 Release command (17H)When an initiator that had reserved the drive using the Reserve com-mand issues the Release command, it cancels the reserv

3.4.13 Mode Sense command (1AH)When the initiator sends this command to the drive, it returns mode pageparameters to the initiator. This command is us

3.4.13.1 Page code and allocation lengthThe Mode Sense command descriptor block contains a page code(byte 2, bits 5–0) and an allocation leng

PagecodeAllocationlengthMode Sense data returned38H1CH4 bytes of Mode Sense header8 bytes of block descriptor2 bytes of mode page header16 b

3.4.13.2 Mode sense data The Mode Sense parameter list contains a 4-byte header followed by a8-byte block descriptor (if any), followed by the mode pa

3.4.14 Start/Stop Unit command (1BH)When the drive receives the Start/Stop Unit command, the drive eitherspins up or spins down, depending on the sett

3.4.15 Receive Diagnostic Results command (1CH)When the drive receives the Receive Diagnostics command, it sendseight diagnostic data bytes to the ini

3.4.15.2 Diagnostic error codesThe following diagnostic error codes are reported in byte 7 of thediagnostic data format in Section 3.4.15.1

3.4.13 Mode Sense command (1AH) . . . . . . . . . . . . . 533.4.14 Start/Stop Unit command (1BH) . . . . . . . . . . . . 5

3.4.16 Send Diagnostic command (1DH)When the drive receives this command, it performs diagnostic tests onitself. In systems that support disconnection

3.5 Group 1 commands3.5.1 Read Capacity command (25H)The initiator uses the Read Capacity command to determine the capacityof the drive. When the driv

3.5.1.1 Read Capacity dataThe Read Capacity data is shown below.BitByte7 6 5 4 3 2 1 00–3 Logical block address4–7 Block length (00000200H)Bytes 0–3 T

3.5.2 Read Extended command (28H)When the drive receives the Read Extended command, it transfers datato the initiator. This command is the same

Bytes 7–8 The transfer length specifies the number of contiguouslogical blocks of data to be transferred. A transfer lengthof 0 means that no lo

Bytes 2–5 The logical block address specifies the logical block wherethe write operation begins.Bytes 7–8 The transfer length specifies the numbe

3.5.5 Write and Verify command (2EH)When the drive receives the Write and Verify command, it writes the datasent by the initiator to the media and the

3.5.6 Verify command (2FH)When the drive receives the Verify command, it verifies the data on thedisc. If the host adapter supports disconnection, the

3.5.7 Read Defect Data command (37H)When the drive receives this command, it reads the defect data off itsreserved cylinders and transfers the defect

allocation length bytes have been transferred or when allavailable defect data has been transferred to the initiator,whichever is less.3.5.7.1 Defect

C.6 Control Mode page (0AH) . . . . . . . . . . . . . . . . . 106C.7 Notch page (0CH) . . . . . . . . . . . . . . .

3.5.8 Write Buffer command (3BH)In conjunction with the Read Buffer command, the Write Buffer commandcan be used in the following ways:• To diagnose p

Byte 3–5 The buffer offset is added to the starting address of thebuffer to determine the destination of the first data byte. Thebytes that follow are

Byte 3–5 The buffer offset is added to the starting address of thebuffer to determine the source of the first data byte. Thebytes that follow are read

3.5.10 Read Long command (3EH)When the drive receives the Read Long command, it transfers data tothe initiator. BitByte7 6 5 4 3 2 1 00 0 0 1 1 1 1 1

3.5.11 Write Long command (3FH)When the drive receives the Write Long command, it writes one logicalblock of data and six bytes of error correction co

3.6 Group 2, 3 and 4 commandsGroup 2, 3 and 4 commands are 10-byte commands. Group 2 commandsare are not implemented. Group 3 and 4 commands are reser

Appendix A. Supported messagesA.1 Single-byte messagesThe implemented single-byte messages are listed below.Code Message name DirectionMustnegate ATN

A.2 Synchronous data transfer request message (01H)The synchronous data transfer message is the only extended messagesupported by the drive. Depending

Appendix B. Sense dataThe appendix contains the descriptions for sense data returned by theRequest Sense command. For more information on the Request

FiguresFigure 1. Typical startup current profile . . . . . . . . . . . . . . . . 9Figure 2. SCSI cable connector . . . . . . .

Byte 2 If the incorrect length indicator (ILI) bit is zero, the re-quested block of data from the previous command did notmatch the logical block le

B.2 Sense keyThe sense keys in the lower-order bits of byte 2 of the sense data returnedby the Request Sense command are described in the following ta

B.3 Additional sense code and additional sense codequalifierThe additional sense code and additional sense code qualifiers returnedin byte 12 and byte

Error code (hex)Description Byte 12 Byte 1311 00 An unrecovered read error occurred.11 01 The read retries were exhausted.11 02 The error was too lon

Error code (hex)Description Byte 12 Byte 1319 01The defect list is not available.19 02There is an error in the primary defect list.19 03There is an e

Error code (hex)Description Byte 12 Byte 132A 00Some parameters were changed by anotherinitiator.2A 01The Mode Select parameters were changedby anoth

Error code (hex)Description Byte 12 Byte 1340 A3The self-test routine discovered a SCSIprotocol error.40 A4The self-test routine discovered a DMA err

Error code (hex)Description Byte 12 Byte 1340 C1A failure occurred while the grown defect listwas being written.40 C2The write life-cycle of the EEPR

Appendix C. Mode pagesMode pages are groups of parameters stored by the drive. Theseparameters can be read using the Mode Sense command and