Set Feature Commands, Set Features Mode | Maxtor 91024D4, 90750D3

INTERFACE COMMANDS

Set Feature Commands

Set Features Mode

Enables or disables features supported by the drive. When the drive receives this command it:

1.Sets BSY,

2.Checks the contents of the Features register,

3.Clears BSY and

4.Generates an interrupt.

If the value of the register is not a feature supported by the drive, the command is aborted. The acceptable values in the Features register are defined as follows:

VALUE	DESCRIPTION
02h*	Enabled write cache

03h	Set transfer mode based on value in Sector Count register
44h	Length of data appended on Read Long/Write Long commands specified in the
	Identify Device information

55h	Disable read look-ahead feature
66h*	Disable reverting to power-on defaults

82h	Disable write cache
AAh*	Enable read look-ahead feature

BBh*	4 bytes of Maxtor specific data appended on Read Long/Write Long commands
CCh	Enable reverting to power-on defaults

* Enabled at power up by default.

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Maxtor 91024D4, 90750D3, 91280D5, 91536D6, 91792D7, 92048D8 manual Set Feature Commands, Set Features Mode

Contents

HA RD Drive Produc T MA Nual DiamondMax Plus Revisions Manual No Before You Begin U T I O N Contents Product Specifications Handling and Installation AT Interface Description Host Software Interface Interface Commands Service and SupportGlossary Figures Manual Organization IntroductionMaxtor Corporation Abbreviations Key Words Signal ConventionsConventions Numbering DiamondMax Plus 5120 Key Features Product Description Product Features Functional / Interface Defect Management Zone DMZ On-the-Fly Hardware Error Correction Code ECCLogical Block Addressing Software ECC Correction Buffer Segmentation Read-Ahead ModeCache Management Automatic Write Reallocation AWR Major HDA Components Cylinder Limitation Subsystem ConfigurationJumper Location/Configuration Dual Drive Support Performance Specifications Product SpecificationsDrive Configuration Models and Capacities Physical Dimensions Parameter Standard Metric EPA Energy Star Compliance Power RequirementsPower Mode Definitions Environmental Limits Reliability Specifications Shock and Vibration Safety Regulatory Compliance Radiated Electromagnetic Field Emissions EMC ComplianceCanadian Emissions Statement Pre-formatted Drive Handling and InstallationHard Drive Handling Precautions Important Notice Unpacking and Inspection Multi-pack Shipping Container Physical Installation Recommended Mounting ConfigurationRepacking Before You Begin General Requirements Mounting Drive in System Attaching Interface Power Cables System Setup Hard Drive Preparation System Hangs During Boot AT Interface Description Interface ConnectorSignal Pin Description Summary PIN Name Signal Name Signal Description Pin Description Table Timing Parameters Mode PIO Timing DMA Timing Ultra DMA Timing Timing Parameters all times in nanoseconds Sustained Ultra DMA Data In Burst Device Terminating an Ultra DMA Data In Burst Initiating an Ultra DMA Data Out Burst Device Pausing an Ultra DMA Data Out Burst Device Terminating an Ultra DMA Data Out Burst Host Software Interface Error RegisterFeatures Register Task File Registers Cylinder Number Registers Sector Count RegisterSector Number Register Device/Head Register Command Register Command Name Command Code Parameters Used SDH Summary Device Control Register Control Diagnostic RegistersAlternate Status Register Digital Input Register Reset and Interrupt Handling Reset HandlingInterrupt Handling Interface Commands Set Feature Commands Read Commands Read SectorsRead Verify Sectors Read DMA Read Multiple Write Sectors Write CommandsSet Multiple Mode Write Verify Sectors Write Multiple Write DMA Set Feature Commands Set Features Mode Power Mode Commands Sleep Mode Initialization Commands Identify Drive 15-8 = PIO data transfer mode = Write Cache enabled Initialize Drive Parameters Seek, Format and Diagnostic Commands Execute Drive DiagnosticFormat Track A.R.T. Command Set Execute S.M.A.R.T No Quibble Service Service and SupportService Policy Support MaxFax Service Customer ServiceInternet Glossary Error Correction Code ECC Direct AccessDirect Memory Access Error Free File Allocation Table FAT Hard ErrorHead Disk Assembly HDA Flux Changes PER Inch Logical Block Addressing Phase Locked Loop PLLLogical Address Logical Sector Recoverable Error Random Access Memory RAMRead Gate Signal Sector Pulse Signal Write Gate Signal UN-CORRECTABLE ErrorUnrecoverable Error THIN-FILM Media