Seagate ST9655 Family Manual

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .ST9655 Family. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Recording and interface technologySpecification ST9655AG ST9550AG ST9385AGInterface ATA ATA ATARecording method RLL (1,7) RLL (1,7) RLL (1,7)Recor

• Track-to-track seek time is an average of all possible single-trackseeks in both directions.• Average seek time is a true statistical random avera

Service life 5 years1.10 Drive acousticsDrive acoustics are measured as sound pressure 1 meter from the drive.Mode MaximumIdle (dBA) 30Seek (dBA) 331.

1.11.5 ShockAll shock specifications assume that the drive is mounted in an approvedorientation with the input levels at the drive mounting s

1.11.6.2 Nonoperating vibrationThe following table lists the maximum nonoperating vibration that aST9655 family drive can experience without

Reset or Soft Reset command from the host. After receiving a Soft Resetcommand, the drive exits Sleep mode and enters Standby mode with allcurrent emu

1.12.2 Power consumptionPower requirements for the ST9655 family drives are listed in the tablesbelow. Typical power measurements are based on an aver

1.12.2.1 Typical current profilesTypical startup and operation current profiles for the ST9655 family drivesare shown in Figures 1 and 2.020040060080

1.12.3 Conducted noiseThe drive is expected to operate with a maximum of:• 150 mV peak-to-peak triangular-wave injected noise at the powerconnector

This equipment is designed to provide reasonable protection againstsuch interference in a residential installation. However, there is noguar

2.0 Drive mounting and configuration2.1 Handling and static-discharge precautionsAfter unpacking, and prior to installation, the drive may be exposed

0.747 ± 0.007 (18.97 ± 0.18)4X 3 mm × 0.5 mm× 0.15 in. (3.81 mm) deepmin. full thread(2 each side)1.375 ± 0.015(34.93 ± 0.38)0.118 ± 0.010(3.00 ±

2.3 Master/slave configurationA master/slave relationship must be established between multiple drivesattached to a single AT bus. You can configure a

Master/slaveconfiguration jumpersCircuit boardPin 1Pin 20 removed for keyingNote. Drive is shown with circuit board up.B DA CDrive

3.0 ATA interfaceThe ST9655 family drives use the industry-standard ATA task file interface.The drives support 8-bit and 16-bit data transfers.

3.2 ATA interface signals and connector pinsThe following diagram summarizes the signals on the ATA interfaceconnector that are supported by the ST9

3.2.1 AT bus signal levelsSignals that the drive sends have the following output characteristics, asmeasured at the drive connector:Logic low 0.0V to

3.3 ATA interface commandsThe following table lists ATA-standard and Seagate-specific drive com-mands that are supported by the ST9655 family drives.

Command nameCommandcodeSupported byST9655 family drivesWrite DMA (no retry) CBHYesWrite Long (w/retry) 32HYesWrite Long (no retry) 33HYesWrite Multipl

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .ST9655 Family. . . . . . . . . . . . . . . . . . . . . . . . . . . .

The following commands are specific to the ST9655 family drives orcontain drive-specific features.3.3.1 Identify Drive commandThe Identify Drive comm

Word DescriptionST9655AG ST9550AG ST9385AG20Controller type = dual-port multisector bufferwith caching0003H0003H0003H21Buffer size (number of512-byte

Word DescriptionST9655AG ST9550AG ST9385AG56Number of sectors pertrack(current emulation mode)xxxxHxxxxHxxxxH57–58Number of sectors (current emulation

* DMA mode settings are reflected in the following bit settings for words62 and 63. Only one mode at a time should be set as currently active.Word Bit

3.3.2 Set Features commandThis command controls the implementation of various drive features.When the drive receives this command, it sets BSY, checks

3.3.3 Rest/Resume commandsSome host systems reduce overall power consumption by temporarilyremoving power from the disc drive. The Rest/Resume process

Bit settings for the Rest command:Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0Command(1F7H)1 1 1 0 0 1 1 1Cyl. High(1F5H)XCyl. Low(1F4H)XDrv. Head(

3.3.3.2 Read Drive State command (E9H)The Read Drive State command allows the host system to save certaindrive parameters to nonvolatile system memor

3.3.3.3 Restore Drive State command (EAH)This command allows the host system to restore the drive to the state itwas in at the time of the power-do

1994 Seagate Technology, Inc. All rights reservedPublication Number: 36270-001, Rev. ASeptember 1994Seagate®, Seagate Technology® and the Seagate log

Seagate Technology, Inc.920 Disc Drive, Scotts Valley, California 95066, USAPublication Number: 36270-001, Rev. A, Printed in USA

Contents1.0 Drive specifications . . . . . . . . . . . . . . . . . . . . . . 11.1 Formatted capacity . . . . . . . .

2.0 Drive mounting and configuration . . . . . . . . . . . . . . 132.1 Handling and static-discharge precautions . . . . . . .

FiguresFigure 1. Typical startup and operation current profile for theST9655AG . . . . . . . . . . . . . . . . . . . . . . . .

1.0 Drive specifications1.1 Formatted capacityST9655AG ST9550AG ST9385AGGuaranteed Mbytes(1 Mbyte = 106 bytes)524 455 341Guaranteed sectors 1,024,128