Maxtor 300 manual Dos

Page 61

Breaking the 137GB Storage Barrier

of the hard disk was accessible. This inability to access the entire drive is referred to as a “capacity barrier” and it has been seen and overcome many times in the computer and disk drive industry.

The 137-gigabyte barrier is the result of the original design specification for the ATA interface that provided only 28 bits of address for data. This specification means a hard disk can have a maximum of 268,435,456 sectors of 512 bytes of data which puts the ATA interface maximum at 137.4 gigabytes.

10,000,000

1,000,000

100,000

10,000

1,000

100

10

Win2000	137GB
WinME	WinXP

			Win98 33GB
		Win95(osr2)		8GB
				8GB
	Win95A		4GB
	Win95A		2GB
	Win 3.x		2GB
DOS 5.x	Win 3.x
DOS 5.x		528MB
4.x	128MB
	128MB
3.x	32MB
10MB	16MB
10MB

1980	1985	1990	1995	2000	2005
10 megabytes:early	PC/XT limit
16 megabytes:	FAT 12 limit
32 megabytes:	DOS 3.x limit
128 megabytes:	DOS 4.x limit
528 megabytes:	Early ATA BIOSs without BIOS extensions
2.1 gigabytes:	DOS file system partition limit
4.2 gigabytes:	CMOS extended CHS addressing limit (not widely experienced)
8.4 gigabytes:	BIOS/Int13 24-bit addressing limit
32 gigabytes:	BIOS limit

A-2 Quickview 300 80/100/120/160/200/250/300GB PATA

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Contents MaxtorQuickview 80/100/120/160/200/250/300GB Pata Patents Publication Number Part Number Before You Begin McCarthy Blvd Milpitas, California Tel Fax Chapter Introduction InstallationChapter General DescriptionATA BUS Interface and ATA Commands Product SpecificationsService and Support Breaking the 137 Gigabyte Storage Barrier Appendix aList of Figures List of Tables Audience Maxtor CorporationProducts SupportTerminology and Conventions Manual OrganizationMSB References Product Overview KEY FeaturesGeneral Description Product EMI/EMS Qualifications Regulatory Compliance StandardsSpace Requirements InstallationUnpacking Instructions 2Quickview 300 20-Pack Shipping Container Hardware Options Pata Interface ConnectorCable Select CS Jumper 1AT Jumper OptionsDrive Select DS Jumper Master Jumper ConfigurationCylinder Limitation Jumper CLJ Power On Standby4AT Connector and Jumper Location 2.1 40-Pin Pata Bus Connector Combination Connector J1Pata BUS Adapter Adapter Board5J1 DC Power and Pata Bus Combination Connector Pata Bus Interface Connector J1, Section C DC Power J1, Section aExternal Drive Activity LED Mounting Orientation Installation Clearance Adapter Board InstallationVentilation For Systems With a Motherboard Pata Adapter8Drive Power Supply and Pata Bus Interface Cables Connecting the Adapter Board and the DriveOperating system limitations Techniques in Drive ConfigurationModels and Capacities Drive ConfigurationPerformance Specifications Parameter Value Physical DimensionsPower Requirements for 250GB/300GB Typical Power Requirements for 80/100/120/160/200GB TypicalVoltage Tolerance EPA Energy Star Compliance Power Mode DefinitionsAcoustic Noise1 Environmental Limits1Baseplate Tempurature Measurement Location Parameter Operating NON-OPERATING Shock and VibrationAnnualized Return Rate Reliability SpecificationsStart/Stop Cycles Data ReliabilityCanadian Emissions Statement Safety Regulatory ComplianceIntroduction Signal Cable and ConnectorMechanical Interface Electrical InterfaceGeneral Feature Set Command InterfaceSupported Commands Command Feature Register Code ValuesFlush Cache SET Multiple Mode 30h Write SectorsWord Content Description10-19 Serial number 20 Ascii characters 20-21 Retired Content Description Minimum PIO transfer cycle time without flow control Minor version number See Address Offset Reserved Area Boot, Incits TR272001 = release interrupt enabled Supported Content Description Reserved 255 Integrity word 15-8 Checksum Signature Product Support/Technical Assistance/Customer Service Service and SupportHistory Breaking the 137 Gigabyte Storage BarrierDOS How is the Extension Implemented? Solving the 137 Gigabyte Capacity BarrierWhat Do the Drives Need to Meet the Spec? What Else is Involved? What is the Next Barrier?Appendix a Appendix C Appendix B Big NumbersGlossary Glossary FCI Acronym for flux changes per inch. See also BPI Initialize See low level formatting Millisecond ms One thousandth of a second .001 sec Glossary Quickview 300 80/100/120/160/200/250/300GB Pata G-7 Glossary Index