Maxtor Computer Drive manual Initialize See low level formatting

Page 62

GLOSSARY

HARD DISK – A type of storage medium that retains data as magnetic patterns on a rigid disk, usually made of an iron oxide or alloy over a magnesium or aluminum platter. Because hard disks spin more rapidly than floppy disks, and the head flies closer to the disk, hard disks can transfer data faster and store more in the same volume.

HARD ERROR – A repeatable error in disk data that persists when the disk is reread, usually caused by defects in the media surface.

HEAD – The tiny electromagnetic coil and metal pole piece used to create and read back the magnetic patterns (write and read information) on the media.

HIGH-LEVEL FORMATTING – Formatting performed by the operating system’s format program. Among other things, the formatting program creates the root directory and file allocation tables. See also low-level formatting.

HOME – Reference position track for re-calibration of the actuator, usually the outer track (track 0).

HOST ADAPTER – A plug-in board that forms the interface between a particular type of computer system bus and the disk drive.

I

INITIALIZE – See low level formatting.

INITIATOR – A SCSI device that requests another SCSI device to perform an operation. A common example of this is a system requesting data from a drive. The system is the initiator and the drive is the target.

INTERFACE – A hardware or software protocol, contained in the electronics of the disk controller and disk drive, that manages the exchange of data between the drive and computer.

INTERLEAVE – The arrangement of sectors on a track. A 1:1 interleave arranges the sectors so that the next sector arrives at the read/write heads just as the computer is ready to access it. See also interleave factor.

INTERLEAVE FACTOR – The number of sectors that pass beneath the read/write heads before the next numbered sector arrives. When the interleave factor is 3:1, a sector is read, two pass by, and then the next is read. It would take three revolutions of the disk to access a full track of data. Maxtor drives have an interleave of 1:1, so a full track of data can be accessed within one revolution of the disk, thus offering the highest data throughput possible.

INTERNAL DRIVE – A drive mounted inside one of a computer’s drive bays (or a hard disk on a card, which is installed in one of the computer’s slots).

J

JUMPER – A tiny box that slips over two pins that protrude from a circuit board. When in place, the jumper connects the pins electrically. Some board manufacturers use Dual In-Line Package (DIP) switches instead of jumpers.

JBOD - Just a Bunch of Drives

K

KILOBYTE (kB) – A unit of measure consisting of 1,024 (210) bytes.

L

LATENCY – The period of time during which the read/write heads are waiting for the data to rotate into position so that it can be accessed. Based on a disk rotation speed of 3,662 rpm, the maximum latency time is 16.4 milliseconds, and the average latency time is 8.2 milliseconds.

LOGICAL FORMAT – The logical drive geometry that appears to an AT system BIOS as defined by the drive tables and stored in CMOS. With an installation program like Disk Manager, the drive can be redefined to any logical parameters necessary to adapt to the system drive tables.

LOOK AHEAD – The technique of buffering data into cache RAM by reading

Maxtor DiamondMax 8S 40GB SATA G-4

Page 61 Page 63
Image 62
Page 61 Page 63
Contents DiamondMax 8S 40GB Serial ATA Product Manual May 13 Revision Part NumberUL/CSA/VDE/TUV /RoHS PatentsClause at Dfars 252.227-7013 and FAR McCarthy Blvd Milpitas, California Tel Fax Table of Contents Service and Support InstallationSata BUS Interface and ATA Commands List of Figures Single Pack Shipping ContainerSata Pin 11 Configuration List of TablesManual Organization Maxtor CorporationAudience ProductsTerminology and Conventions SataReference SOFMaxtor DiamondMax 8S 40GB Sata Product Description KEY Features Serial ATA InterfaceVersatility PerformanceReliability Product EMI/EMS Qualifications Regulatory Compliance StandardsHardware Requirements Models and Capacities Product SpecificationsDrive Configuration 40GB Performance SpecificationsPhysical Dimensions Power Requirements Power Mode DefinitionsTrack Following EPA Energy Star ComplianceEnvironmental Limits At SpeedShock and Vibration Parameter Operating NON-OPERATINGReliability Specifications Canadian Emissions StatementSafety Regulatory Compliance RoHS ComplianceInstallation Space RequirementsUnpacking Instructions 2Single Pack Shipping Container325 Pack Shipping Container Staggered Spin-up Hardware OptionsJumper Position 4DiamondMax 8S 40GB Sata Power/Interface Connector SATA-P11 Mounting Orientation6Mounting Dimensions and Clearance External Drive Activity LED Sata Bus Interface ConnectorVentilation Connecting the Adapter Board and the Drive For Systems with AN ADD-IN Sata Adapter Board2Device Plug Connector Pin Definitions 7Drive Power Supply and Sata Bus Interface Cables 8Completing the Drive Installation Mechanical Interface Sata BUS Interface and ATA CommandsCommand Interface Register Address DecodingSupported Commands Command Feature Register Code ValuesCommand Feature Register Code Values DBh Write Mulitple EXT Word Content Description Word Content Description Word Content Description Minimum Multiword DMA transfer cycle time per word ATA Bus Interface and ATA Commands Word Content Description Word Content Description Word Content Description Word Content Description Word Content Description Word Content Description = Ultra DMA mode 6 is selected Word Content Description ATA Bus Interface and ATA Commands Word Content Description Word Content Description Product Support Service and SupportWarranty Services Glossary Maxtor DiamondMax 8S 40GB Sata G-2 FCI Acronym for flux changes per inch. See also BPI Initialize See low level formatting Kilobyte kB a unit of measure consisting of 1,024 210 bytesMB See megabyte Millisecond ms One thousandth of a second .001 secMaxtor DiamondMax 8S 40GB Sata G-6 Transfer Rate The rate at which Maxtor DiamondMax 8S 40GB Sata G-8 Clearance 4-6,4-7,4-8
Top Page Image Contents