HP Compaq Business Desktop dx2000 Informations techniques télécharger pdf (Page 29)

Service Reference Guide, dx2000 uT 359782-002 4–3

Ultra ATA Drive Guidelines and Features

4.3.1 Device Classes

In order to determine the best drive attach sequence, ATA/ATAPI drives are segregated into four

different classes based upon the bandwidth demands they place on an ATA controller. The most

demanding devices are in Class 1 and the least demanding are in Class 4.

General Attach Guidelines

■ The lower the device class number, the faster the device and the more bandwidth required.

■ Drives installed in the Device 0 positions on both the primary and secondary controllers

receive the greatest possible bandwidth.

■ The bootable ATA hard drive should always be installed on the primary controller in the

Device 0 position.

4.3.2 Attach Sequence Rules by Class Priority

Drives should be attached in the sequence shown for optimum performance starting at

position 1.

*If there are three or more devices, two or more of which are hard drives, two hard drives should

be attached to the primary controller first before following the General Attach Sequence Rule.

Class 1

Hard

Drives

Class 2

High Speed

Optical Drives

Class 3

Optical Storage

Drives

Class 4

Magnetic

Storage Drives

ATA-100

ATA-66

ATA-33

DVD

DVD-CD R/W

R/W CD-ROM

CD-ROM

LS-120

Tape

Zip

Primary

Controller*

Secondary

Controller

Device 1 Device 0

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 105 106

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HP Compaq Business Desktop dx2000 Informations techniques Page 29

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