Maxtor 300 manual Glossary

Page 65

GLOSSARY

A

ACCESS – (v) Read, write, or update information on some storage medium, such as a disk. (n) One of these operations.

ACCESS TIME – The interval between the time a request for data is made by the system and the time the data is available from the drive. Access time includes the actual seek time, rotational latency, and command processing overhead time. See also seek, rotational latency, and overhead.

ACTUATOR – Also known as the positioner. The internal mechanism that moves the read/write head to the proper track. The Maxtor actuator consists of a rotary voice coil and the head mounting arms. One end of each head mounting arm attaches to the rotor with the read/write heads attached at the opposite end of each arm. As current is applied to the rotor, it rotates, positioning the heads over the desired cylinder on the media.

ALLOCATION – The process of assigning particular areas of the disk to particular files. See also allocation unit.

ALLOCATION UNIT – An allocation unit, also known as a cluster, is a group of sectors on the disk that can be reserved for the use of a particular file.

AVERAGE SEEK TIME – The average time it takes for the read/write head to move to a specific location. To compute the average seek time, you divide the time it takes to complete a large number of random seeks all over the disk by the number of seeks performed.

B

BACKUP – A copy of a file, directory, or volume on a separate storage device from the original, for the purpose of retrieval in case the original is accidentally erased, damaged, or destroyed.

BAD BLOCK – A block (usually the size of a sector) that cannot reliably hold data because of a media flaw or damaged format markings.

BAD TRACK TABLE – A label affixed to the casing of a hard disk drive that tells which tracks are flawed and cannot hold data. The listing is typed into the low-level formatting program when the drive is being installed.

Because Maxtor disk drive’s defect-management scheme handles all such flaws automatically, there is no need to concern yourself with bad track tables.

BIT – Abbreviation for binary digit. A binary digit may have one of two values—1 or 0. This contrasts with a decimal digit, which may have a value from 0 to 9. A bit is one of the logic 1or logic 0 binary settings that make up a byte of data. See also byte.

BLOCK – A sector or group of sectors. By default, a block of data consists of 512 bytes.

Quickview 300 80/100/120/160/200/250/300GB PATA G-1

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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 DescriptionService and Support Product SpecificationsATA BUS Interface and ATA Commands 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 External Drive Activity LED DC Power J1, Section aPata Bus Interface Connector J1, Section C 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 DimensionsVoltage Tolerance Power Requirements for 80/100/120/160/200GB TypicalPower Requirements for 250GB/300GB Typical 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 What Do the Drives Need to Meet the Spec? Solving the 137 Gigabyte Capacity BarrierHow is the Extension Implemented? Appendix a What is the Next Barrier?What Else is Involved? 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
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